El-Shafei, A. K.; El-Kashef, H. S.; El-Khawaga, A. M., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1982, vol. 21, # 7, p. 655 - 657
El-Shafei, A. K.; El-Kashef, H. S.; El-Khawaga, A. M., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1982, vol. 21, # 7, p. 655 - 657