BOUNDARY CONDITIONS FOR THE USADEL EQUATIONS AND PROPERTIES OF DIRTY S-N-S SANDWICHES Z. G. Ivanov, M. Yu. Kupriyanov, K. K. Likharev et O. V. SnigirevJ. Phys. Colloques, 39 C6 (1978) C6-556-C6-557DOI: https://doi.org/10.1051/jphyscol:19786250