Low field magnetization measurements on single crystals of superconducting YBa2Cu3O7-δ J. Hammann, M. Ocio, A. Bertinotti, D. Luzet, E. Vincent, A. Revcolevschi et J. Jegoudez J. Phys. France, 48 10 (1987) 1593-1597 DOI: 10.1051/jphys:0198700480100159300