Gupta, Y. P.; Chawla, Ravinder; Sawal, K. K., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1982, vol. 21, # 7, p. 652 - 654
Gupta, Y. P.; Chawla, Ravinder; Sawal, K. K., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1982, vol. 21, # 7, p. 652 - 654