Ibrahim, Mohamed Kamal Ahmed; Elghandour, Ahmed Hafez; Abou-Hadeed, Khaled, Phosphorus, Sulfur and Silicon and the Related Elements, 1991, vol. 60, # 1.2, p. 119 - 123
Ibrahim, Mohamed Kamal Ahmed; Elghandour, Ahmed Hafez; Abou-Hadeed, Khaled, Phosphorus, Sulfur and Silicon and the Related Elements, 1991, vol. 60, # 1.2, p. 119 - 123