求助英文文献一篇 题目: Studies on bismuth(III) complexes of ligands containing nitrogen/sulfur and extractive procedure for determination of Bi(III) 作者:Eman M. Saad, Mohammad S. El-Shahwai, Hala Saleh and Ahmed A. El-Asmy 期刊: Transition Metal Chemistry, Volume 32, Number 2 / 2007年3月