Egyptian Statistical Journal Volume 37 No. 2 Dec. 1993 (3GdeLdI GdCMUGFjI GdeUQjI GdeLdO (B37 (3GdYOO GdKGfj OjSeHQ (B1993s - Periodical (Egypt Institute of statistical Studies & Research Cairo University, 1993)
Keywords: Social Sciences (3GdYdhe GdGLJeGYjIs; General