Volume 57, Issue 129, April 2011, Pages 1-17
S.M. SAYED; MARIUM F. MANSY; S.M. EL-BERBAWY
Volume 56, Issue 125, April 2010, Pages 1-11
A.M.E. ASAWY; M.M. ABD EL-LATIF
Volume 55, Issue 120, January 2009, Pages 1-13
S.M. SAYED; M.M. ABD EL-HAFEEZ