Volume 5, Issue 1, June 1980, Pages 40-57
S. A. Hassan; Youssif A. E. Abed; L. A. E. El-Zeftawy
Volume 4, Issue 2, December 1979, Pages 51-60
E. H. El-Konyaly; Youssif A. Abed; Mahmoud Saber Ahmed Kandil
Volume 4, Issue 2, December 1979, Pages 71-91
Youssif A. Abed; Mohamed Abd El-Moniem Mohamed Tantawy
Volume 4, Issue 2, December 1979, Pages 92-102
Youssif A. Abed
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