Ahmad, M. S.; Siddiqi, Ahsan R.; Moinuddin, G., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1981, vol. 20, # 9, p. 812 - 813
Ahmad, M. S.; Siddiqi, Ahsan R.; Moinuddin, G., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1981, vol. 20, # 9, p. 812 - 813