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