Volume 40.1, Issue 79, October 1998, Pages 150-156
T.Y. Abd-El- Motelib; A.M. Abd-ElGwad; H.A. Azzaz
Volume 38.2, Issue 76, January 1998, Pages 90-97
A.M. Abd-El Gwad; Seham M. Aly; H.A. Azzaz