INFLUENCE OF Nb4O SUBOXIDES IN THE SUBSTRATE UPON PROPERTIES OF Nb3Sn TAPE SUPERCONDUCTOR J. Neuschl, D. Synak, M. Jergel, I. Hlásnik et J. Ivan J. Phys. Colloques, 45 C1 (1984) C1-413-C1-416 DOI: 10.1051/jphyscol:1984184