V. V. ANDRIANOV, V. P. BAEV, Yu. P. IPATOV, S. P. MALYSHENKO, R. G. MUCHNIK, A. V. RYCHAGOV, V. E. SYTNIKOV, and N. Ya. TOMENKO, Composite superconductors coated with Cu oxide to intensify heat transfer, Low Temp. Phys. 16, (1990) [Fiz. Nizk. Temp. 16, 504-507, (1990)].