Imoto, Masahiro; Yoshimura, Hiroyuki; Yamamoto, Michiharu; Shimamoto, Tetsuo; Kusumoto, Shoichi; Shiba, Tetsuo Bulletin of the Chemical Society of Japan, 1987, vol. 60, p. 2197 - 2204 doi: 10.1246/bcsj.60.2197