Citation: Asano, H.; Akinaga, H.; Katoh, H.; Takita, K.; Masuda, K.; Nishino, M.; Imai, M.; Ishigaki, T. (1987). Crystal structure of the high-Tc superconductor Ln Ba2 Cu3 O7-d (Ln= Sm, Eu and Gd). Japanese Journal of Applied Physics, Part 2, 26, pp. 1410-1412.