Volume 58, Issue 135, October 2012, Pages 67-70
NAGAH M. SAAD; WALLAA F. AMIN
Volume 57, Issue 131, October 2011, Pages 1-12
WALLAA F. AMIN; EMAN M. SHAKER
Volume 56, Issue 124, January 2010, Pages 1-11
WALLAA F. AMIN; KARIMA G. ABDEL-HAMEED