Kusama, Hiroyuki; Hara, Ryoma; Kawahara, Shigeru; Nishimori, Toshiyuki; Kashima, Hajime; Nakamura, Nobuhito; Morihira, Koichiro; Kuwajima, Isao Journal of the American Chemical Society, 2000, vol. 122, # 16 p. 3811 - 3820 doi: 10.1021/ja9939439