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Helvetica Physica Acta

Helvetica Physica Acta Volume 65 (1992)
Überschrift Seite
Cahier 1 1
Article Complete sets of compatible non selfadjoint observables
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1
Article Asymptotic expansion of the Stark-Wannier states
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11
Article Perturbative renormalization and effective Langrangians in Φ^4_4
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32
Article Unitary time evolution for irregular external field problems
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53
Article Diffusive repair for the Ginzburg-Landau equation
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56
Article Stability of needle-crystals in the symmetric model of solidification
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93
Informations des associations Rapport de la réunion d'automne de la SSP
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109
Cahier 2-3 131
Article Facts and fantasies in FQHE theory
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133
Article Two recent experiments on the fractional quantized Hall effect
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143
Article Edge voltages and distributed currents in the quantum Hall effect
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151
Article Edge states in the quantum Hall effect as generalized fermi surface singularities
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152
Article Surface acoustic wave studies of the fractional quantum Hall regime
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153
Article Quantum Hall effect without Landau quantization
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164
Article Theories of superconductivity (a few remarks)
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173
Article Two-dimensional superconductivity in ultrathin disordered thin films
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187
Article Quenching of superconductivity in disordered thin films by phase fluctuations
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197
Article Superconductivity in quasi-two-dimensional systems : theoretical aspects
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205
Article Superlattices of hits cuprates : investigations of 2D ultrathin layers and the crossover to 3D anisotropic films
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215
Article Anyons in the quantized Hall effect and in models of high temperature superconductors
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218
Article Josephson junction arrays and superconducting wire networks
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219
Article Charge-vortex duality in Josephson junction arrays
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228
Article The flux-phase problem on planar lattices
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247
Article SO(4) symmetry of the Hubbard model and its experimantal consequences
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256
Article Quantum-Monte-Carlo studies of superconductivity in strongly correlated systems
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257
Article Exact diagonalization studies of 2D quantum models
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268
Article Quantum Monte Carlo simulations : algorithms, limitations and applications
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278
Article Conformal field theory and statistical mechanics
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289
Article Mathematical survey of some two dimensional dynamical systems
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290
Article Statistical mechanics on a 2D-random surface
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291
Article Experiments on melting in classical and quantum two dimensional electron systems
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297
Article After-dinner speech on board the ship "Ville de Neuchâtel"
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307
Article Point-contact spectroscopy on tunable constrictions in GaAs
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313
Article Violation of Ehrenfest's theorem in particle dynamics of quantum Hall systems
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315
Article Multifractality and scaling in disordered 2-D Landau levels
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317
Article Hysteresis effects in mesoscopic rings in the quantum Hall regime
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319
Article Quantum fluctuations in the transmission of a ballistic metallic constriction
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321
Article Excitonic recombination of Donor bound excitons in selectively doped MQW under high magnetic fields
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323
Article The magnetoconductance of the 2d systems of electrons on liquid helium in the extreme quantum limit
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325
Article Quenching of the Hall effect in two dimensional narrow systems
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327
Article Exchange and polariton effects for excitons in Al_1-xGa_xAs-GaAs quantum wells
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329
Article Imaging the current distribution in the quantum Hall effect
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331
Article Electron phonon interactions in a disordered 2d electron gas in a magnetic field
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333
Article Coulomb blockade in a 2d electron gas
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335
Article Incompressible quantum liquid versus two-dimensional electron solid
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337
Article Two-dimensional channel from Ga_0.65Al_0.35As-GaAs undoped heterojunction
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339
Article The role of edge currents in dissipative transport at strong magnetic fields
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341
Article Resonant Raman scattering in quantum wells under high magnetic fields
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343
Article FQHE in the disk geometry : exact diagonalization for few electrons and extrapolation to the bulk limit
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345
Article Determination of electron exchange energy in a 2DES by nuclear magnetic relaxation
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347
Article On the theory of kinetic properties of perfect two-dimensional conducting systems
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349
Article Hydrodynamic effects in electric conductivity of two dimensional metals
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351
Article Magnetotransport in 2D system in parallel and tilted magnetic fields
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353
Article Theory of 2D conductivity in almost parallel magnetic fields : the role of the third dimension
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355
Article Current dependence of the Shubnikov-de Haas peaks in GaAs - Al_xGa_1-xAs heterostructures
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357
Article Non-locality of the gapless plasma excitations in the QHE
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359
Article Universal dependence of eigenvectors of tight-binding models on Bloch momenta
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361
Article Plasmaron excitation in a 2D electron gas
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363
Article Magnetically catalyzed superconductivity in 2D
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367
Article What symmetry is broken in the superconductor - normal phase transition?
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369
Article The effects of inherent bond disorder on the rf properties of SNS Josephson junction arrays
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371
Article Self-field effects and subharmonic Shapiro steps in Josephson junction arrays
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373
Article Vortex motion in type II superconductors of reduced dimensionality
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375
Article Charge dynamics in junction arrays
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379
Article Quantum phase transitions in Josephson junction arrays
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381
Article Propagating vortex beams in Josephson-junction arrays
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383
Article Observing an Ising transition in Josephson-junction arrays
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385
Article Optical response of CuO_2-plane and CuO-chain in YBaCuO
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387
Article Zero applied force magnetic flux noise in Josephson junction arrays
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389
Article Vortex dynamics in superconducting fractal networks
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391
Article Two-dimensional electron localization in bulk single crystals of Bi_2Sr_2Ca_1-xY_xCu_2O_8
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393
Article Giant tunneling anisotropy of a high temperature superconductor
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395
Article Imaging the current density in superconducting thin films
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397
Article Flux creep : the stochastic approach
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399
Article Temperature dependence of critical current and activation energy due to layered structure in oxide superconductors
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402
Article 2D de Haas-van Alphen effect in the superconducting state
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404
Article Experimental investigation of two-dimensional arrays of ultrasmall Josephson junctions
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406
Article Crossover from three- to two-dimensional behavior of the vortex energies in layered XY-models for high T_c superconductors
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408
Article Nonperturbatively renormalizable quantum field theories in 2+1 dimensions
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411
Article Anharmonic phonons and electronic correlations in high-T_c superconductors : a quantum Monte Carlo study
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413
Article Corrections to fermi liquid behaviour in D=2 : DOS
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415
Article Monte Carlo simulation of the 1D-quantum roughening model : evidence of a KTB transition
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417
Article Dynamics of spin and charge fluctuations in a t-J model
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419
Article Dynamics of charge carriers in 2-D quantum antiferromagnets
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421
Article Slave Boson approach to magnetic order in the Hubbard model
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423
Article Critical behaviour at the metal-insulator transition in 2D systems with spin orbit scattering
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425
Article SO(3)-σ model of doped two-dimensional spin 1/2 Heisenberg antiferromagnet
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427
Article Order and fluctuations in coupled XY planes
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429
Article Single-particle spectrum for high-T_c superconductors : a numerical study
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431
Article Conserving approximation for the multi-band Hubbard model
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433
Article Finite-size effects in the negative U Hubbard model
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435
Article Ground state phase diagram of the two-dimensional Kondo lattice
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437
Article Numerical study of a projected Hubbard model
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439
Article The phase diagram of the Haldane chain mapped onto the surface roughening problem
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441
Article Lyapunov exponents of the Schrödinger equation with quasi-periodic potential on a strip
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443
Article Singular dynamics of a fermion coupled to the planar antiferromagnet
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446
Article Antiferromagnets in 2 + ε dimensions
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448
Article Superconductivity of the mixed s and d-type symmetry in the t-J model
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450
Article The hole excitation spectrum in CuO_2 plane
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452
Article Magnetic properties of the Hubbard model with infinite interaction
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454
Article Resonance (surface) phonon transport through point contacts
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456
Article Low temperature properties of two dimensional frustrated quantum antiferromagnets
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458
Article Kinetic roughening in molecular-beam epitaxy
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463
Article Two-dimensional spin systems in a magnetic field close to criticality
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465
Article Vortex and domain wall dynamics of 2d-XY model with in-plane magnetic field
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467
Article Jones polynomial and the Potts model
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469
Article Dynamics of defects near melting of classical 2D electrons
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471
Article Two-dimensional melting of hexatic magnetic bubble arrays
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473
Article Statistical properties of 2D periodic Lorentz gas with infinite horizon
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475
Article Is the Kosterlitz-Thouless transition 'exotic'?
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477
Article Vortices : collective variables for turbulence in Josephson arrays
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479
Article Frustrated XY model : continuity of the ground state energy in function of the frustration
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482
Article Crossover from two to three dimensions in the layered xy-model
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484
Article High resolution photoemission investigation of phase transitions in 1T-TaS_2
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486
Article Superconducting vortices and the two-dimensional electron gas
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488
Article One electron dimple on a thin helium film
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490
Article Destruction of superconductivity in Josephson junction arrays by positional disorder
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492
Article Chaotic dynamics of fluxons in large-area Josephson junctions
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494
Article Soliton mechanism of optical anisotropy photoinduction in layered molecular structures
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497
Article Vortex corrections to the SCHA in the 2D-XY model
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499
Article Long-time dynamics of two-dimensional fluid binary mixture in cellular automata models
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501
Index Index of authors
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503
Cahier 4 505
Article Subordinacy and spectral theory for infinite matrices
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505
Article Perturbation theory for time dependent hamiltonians : rigorous reduction theory
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528
Article Heisenberg antiferromagnet on triangulated trees
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560
Article Critical points of the "entropy"-like functional for the quantum distribution functions
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596
Article Antinucleon-nucleon scattering formalism and possible tests of CPT invariance
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611
Cahier 5 641
Article Classical theories, atomicity and nonclassical theories
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641
Article Finite temperature Schwinger model
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652
Article An infinite volume expansion for many fermion Green's functions
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679
Article Approximation semi-classique du propagateur d'un système électromagnétique et phénomène de Aharonov-Bohm
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722
Article Semiclassical expansions of the thermodynamic limit for a Schrödinger equation. II, The double well case
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748
Cahier 6 767
Article Instability of SU(2) Einstein-Yang-Mills solitons and non-abelian black holes
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767
Informations des associations Rapport de la réunion d'automne de la SSP
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820
Cahier 7 887
Article Complete sets of commuting observables and irreducible sets of observables
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887
Article A Lorentz covariant description of the classical radiation field
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898
Article On the description of single massless quantum objects
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910
Article Michel's theorem and critical sections of gauge functionals
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922
Article First order coherent Boson states
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965
Article Diffusion in the kicked quantum rotator by random corrections to a linear and sine field
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985
Cahier 8 993
Article Chiral current algebras in three-dimensional BF-theory with boundary
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993
Article Fierz transformation and dimensional regularization
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1011
Article Local dynamics of mean-field quantum systems
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1016
Article Defining relative energies for the projected Ising measure
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1055
Article Algebraic treatment of the Morse potential
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1069
Article Résonances pour l'opérateur de DIRAC-II
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1077
Article On the definition of time delay in scattering theory
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1119
Table des matières
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1127
Index Index of authors = Autorenregister = Table des auteurs
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1135