Volume 32.1, Issue 63, October 1994, Pages 126-130
M.A. SIAM; G.H. SALEM; NAHID H. GHONEIM; S.A. MICHAEL; MAGDA A.H. EL-REFAY
Volume 23.1, Issue 45, April 1990, Pages 75-79
M.M. ABU EL-MAGD; Z.G. AHMED; S.A. MICHAEL