Volume 28.2, Issue 56, January 1993, Pages 205-210
R.S. REFAIE; A.A. ABOU EL-ALLA; SEHAM, M.A.; A.M. SAYED
Volume 28.1, Issue 55, October 1992, Pages 189-194
A.A. ABOU EL-ALLA; R.S. REFAIE; SHEAM, M.A.; A.M. MANAA
Volume 27.1, Issue 53, April 1992, Pages 147-152
R.S. REFAIE; A.A. ABOU EL-ALLA; BAHY EL-GA MAL GALAL