Volume 45.2, Issue 90, July 2001, Pages 43-54
O.S. Afifi; A. El-Din Zain
Volume 45.2, Issue 90, July 2001, Pages 394-409
A. El Din Zain; O.S. Afifi
Volume 43.1, Issue 85, April 2000, Pages 95-109
O.S. Afifi; Y.A. Dowidar