Volume 9, Issue 17.18, January 1982, Pages 5-10
A. HIFNY; A.K. AHMED; K.E. HASHIM
Volume 8, Issue 15.16, January 1981, Pages 13-17
A. HIFNY; A.K. AHMED; K.E. HASHIM
Volume 8, Issue 15.16, January 1981, Pages 19-25
A. HIFNY; A.K. AHMED; K.E. HASHIM