Kumar, Ajay; Malhotra, Sanjay; Vats, Archana; Himanshu; Singh, Sanjay K.; Sharma, Sunil K.; Prasad, Ashok K.; Errington, William; Olsen, Carl E.; Jain, Subhash C.; Parmar, Virinder S.
Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2002 , vol. 41, # 2 p. 360 - 367

Sakakibara, Tsutomu; Kume, Takashi; Shimohara, Kumiko; Fujishima, Hiroshi; Hara, Shunpei; Shimoda, Toshifumi
Heterocycles, 1990 , vol. 31, # 3 p. 459 - 472