Awad, Ibrahim M. A.; Abdel-Rahman, Abdu E.; Bakhite, Etify A., Phosphorus, Sulfur and Silicon and the Related Elements, 1991, vol. 57, # 34, p. 293 - 301
Awad, Ibrahim M. A.; Abdel-Rahman, Abdu E.; Bakhite, Etify A., Phosphorus, Sulfur and Silicon and the Related Elements, 1991, vol. 57, # 34, p. 293 - 301