(untitled) - Zolfigol, M A; Poor-Baltork, I M; Mirjalili, B F; Shirini, F; Salehzadeh, S; Keypour, H; Ghorbani-Choghamarani, A; Zebarjadian, M H; Mohammadi, K; Hazar, A (Phosphorus, Sulfur Silicon Relat. Elem., 2003)