Zhang, Chengxiang; Chen, Ruyu; Tang, Chuchi; Zhang, Zhongbiao
Phosphorus, Sulfur and Silicon and Related Elements, 1998 , vol. 132, p. 155 - 161

Delaveau; Mouloungui; Gaset
Synthetic Communications, 1996 , vol. 26, # 12 p. 2341 - 2348