Kigoshi, Hideo; Ojika, Makoto; Ishigaki, Takeshi; Suenaga, Kiyotake; Mutou, Tsuyoshi; Sakakura, Akira; Ogawa, Takeshi; Yamada, Kiyoyuki Journal of the American Chemical Society, 1994, vol. 116, # 16 p. 7443 - 7444 doi: 10.1021/ja00095a072