Volume 4.1, Issue 7, January 1977, Pages 77-83
Mansour, M.A.; Tawfik, M.A.; Zaki, K.
Volume 3, Issue 5, May 1976, Pages 161-168
Tawfik, M.A.
Volume 1, Issue 1.2, May 1974, Pages 47-57
El-Sherry, M.I.; Tawfik, M.A.