Okuno, Yohmei; Horita, Kiyoshi; Yonemitsu, Osamu; Shibata, Kazue; Amemiya, Toshiyuki; Holm, Richard H.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1984 , # 5 p. 1115 - 1118

Zahn,H.; Schade,F.
Chemische Berichte, 1963 , vol. 96, p. 1747 - 1750