Ryu, Ilhyong; Matsumoto, Koichi; Kameyama, Yasuhiro; Ando, Masato; Kusumoto, Nobuo; Ogawa, Akiya; Kambe, Nobuaki; Murai, Shinji; Sonoda, Noboru Journal of the American Chemical Society, 1993 , vol. 115, # 26 p. 12330 - 12339