HOW THE STATISTICS OF PINNING CENTRES INFLUENCE ON V-I CHARACTERISTICS OF SUPERCONDUCTORS Yu.K. Krasnov, L.V. Matushkina and V.A. Shukhman J. Phys. Colloques, 39 C6 (1978) C6-631-C6-632 DOI: 10.1051/jphyscol:19786284