MAGNETIC FIELD PENETRATION IN SINGLE CRYSTAL AND POWDER DyBa2Cu3O7-x AND GdBa2Cu3O7-x E. Vincent, J. Hammann, J. A. Hodges, H. Noel, M. Potel, J. C. Levet et P. Gougeon J. Phys. Colloques, 49 C8 (1988) C8-2175-C8-2176 DOI: 10.1051/jphyscol:19888975