Simulation of the d.c. critical current in superconducting sintered ceramics R. Riedinger, P. Habig, E.K. Hlil, M. Arnaud et C. Boulesteix Rev. Phys. Appl. (Paris), 25 1 (1990) 67-72 DOI: 10.1051/rphysap:0199000250106700