Cammidge, Andrew N.; Cook, Michael J.; Harrison, Kenneth J.; McKeown, Neil B.
Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1991 , # 12 p. 3053 - 3058

Tarrago, Georges; Marzin, Claude; Najimi, Ouafa; Pellegrin, Valdo
Journal of Organic Chemistry, 1990 , vol. 55, # 2 p. 420 - 425

Moldenhauer et al.
Justus Liebigs Annalen der Chemie, 1953 , vol. 580, p. 169,187

Qian, Changtago; Zhu, Dunming
Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1972-1999), 1994 , # 10 p. 1599 - 1604