Sahu, Rajesh K.; Magan, Archana; Gupta, Bina; Sondhi, Sham M.; Srimal, Rikshab C.; Patnaik, Gyander K.
Phosphorus, Sulfur and Silicon and the Related Elements, 1994 , vol. 88, # 1-4 p. 45 - 52

Mathes et al.
Journal of the American Chemical Society, 1948 , vol. 70, p. 1452