Anjaneyulu, A. S. R.; Mallavadhani, U. V.; Sudharani, G., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1988, vol. 27, # 1-12, p. 233 - 237
Mohan, Santosh Bala; Pal, Krishan; Murti, V. V. S., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1982, vol. 21, # 8, p. 714 - 717