Rao; Ravishankar; Trivedi
Indian Journal of Chemistry - Section B Organic Chemistry Including Medicinal Chemistry, 1990 , vol. 29, # 3 p. 207 - 214

Sain, Bir; Prajapati, Dipak; Mahajan, Asha R; Sandhu, Jagir S
Bulletin de la Societe Chimique de France, 1994 , vol. 131, # 3 p. 313 - 316