Volume 58, Issue 133, April 2012, Pages 31-40
M.H. AL-GAABARY; S.A. OSMAN; K.M. ABO EL-SOUD; A.I. HASSAN
Volume 51, Issue 104, January 2005, Pages 1-16
DALAL, S.M. MOSTAFA; K.E. EL-EKHNAWY; M.A. HEGAZY