Volume 12.1, Issue 23, May 1984, Pages 60-65
M.K. EL-NAFFAR; M.F. SAOUD; I.M. HASSAN
Volume 12.1, Issue 23, May 1984, Pages 68-76
M.K. EL-NAPPAR; M.F. SAOUD; I.M. HASSAN
Volume 11.1, Issue 21, June 1983, Pages 140-148
M.K. EL-NAFFAR; M.F. SAOUD; I.M. HASSAN