Volume 30.1, Issue 59, October 1993, Pages 229-233
S.T. EL-ZOMOR; K.A. FARAG; M.B. MOSTAFA; F.M. FARAG
Volume 29.1, Issue 57, April 1993, Pages 177-183
M.B. MOSTAFA; K.A. FARAG; S.T. EL-ZOMOR