McFarlane, H. Christina E.; McFarlane, William; Nash, John A.
Journal of the Chemical Society, Dalton Transactions: Inorganic Chemistry (1972-1999), 1980 , # 1 p. 240 - 244
Argent, Peter J.; Healy, James D.; Ibrahim, Ezzeldine H.; Shaw, Robert A.; Woods, Michael
Phosphorus and Sulfur and the Related Elements, 1981 , vol. 12, p. 95 - 102