Vaid, R. K.; Dhindsa, G. S.; Kaushik, B.; Singh, S. P.; Dhawan, S. N.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1986 , vol. 25, p. 569 - 570

Singh, S. P.; Kodali, Dharma R.; Prakash, Indra; Prakash, Om; Sawhney, S. N.
Indian Journal of Chemistry, Section B: Organic Chemistry Including Medicinal Chemistry, 1984 , vol. 23, # 2 p. 125 - 128