Volume 55, Issue 120, January 2009, Pages 1-13
S.M. SAYED; M.M. ABD EL-HAFEEZ
Volume 51, Issue 104, January 2005, Pages 62-75
NAHED M. WAHBA; M.M. ALI; M.M. ABD EL-HAFEEZ
Volume 29.1, Issue 57, April 1993, Pages 184-196
M.T. NASSEF; M.A. ALI; A.S. SALEH; M.M. ABD EL-HAFEEZ