Volume 29.2, Issue 58, July 1993, Pages 232-237
M.A. EL-AZAB; T.M. BARAKAT; G. SHAWKI; A. BADR
Volume 29.2, Issue 58, July 1993, Pages 245-253
M.A. EL-AZAB; A. BADR; G. SHAWKI; S.S. ABD EL-MEGED