(1)
L. F. Rybaltchenko, N. Hohn, R. Muller, R. Borowski, B. Buchner, W. Schafer, D. Wohlleben, and l. K. Yanson,
Temperature-dependent point-contact characteristics of YBa
2
Cu
3
O
x
-Ag
,
Low Temp. Phys.
18, (1992) [
Fiz. Nizk. Temp.
18, 591-592, (1992)].