[1]
Y. A. IBRAHIM, A. G. HANNA, M. H. ELGAMAL, R. F. ALLAM, and K. M. YOUSSEF, “?SYNTHESIS OF SOME NEW NITROGENOUS DERIVATIVES OF GLYCYRRHETIC ACID WITH POTENTIAL BIOLOGICAL ACTIVITY”, Pakistan Journal of Scientific & Industrial Research, vol. 38, no. 3-4, pp. 101–107, May 1995.