Volume 40.2, Issue 80, January 1999, Pages 310-318
A.Kh. Abdel-Razek
Volume 40.1, Issue 79, October 1998, Pages 1-22
G.A. Megahed; A. El-Din Zain; S.S. El-Ballal
Volume 35.1, Issue 69, April 1996, Pages 42-63
Mamdouh M. ANWAR; G.A. MEGAHED; THORYA S. EI-DEEB; H.S. SHEHATA