Setsune, Jun-ichiro; Wakemoto, Hirofumi; Matsueda, Taizo; Matsuura, Toshikazu; Tajima, Hideaki; et al. Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1984 , # 10 p. 2305 - 2310