(1)
A. GRASSMANN, J. SCHLOTTERER, M. KLAUDA, J. STROBEL, and G. SAEMANN-ISCHENKO, Photoemission study of electron-doped super conducting curpates, Low Temp. Phys. 16, (1990) [Fiz. Nizk. Temp. 16, 625-626, (1990)].