Khasnis, Dilip V.; Burton, Jonathan M.; McNeil, Jeffrey D., Phosphorus, Sulfur and Silicon and the Related Elements, 1993, vol. 75, # 1-4, p. 253 - 256
Khasnis, Dilip V.; Burton, Jonathan M.; McNeil, Jeffrey D., Phosphorus, Sulfur and Silicon and the Related Elements, 1993, vol. 75, # 1-4, p. 253 - 256