. (3GdYdhes - . (3GdedcGhj, aJMjs; Fathy Elmelkawy ((3YeGfs (3hRGQI GdJQHjI hGdJYdje, GdeOjQjI GdYGeI ddefGgL hJbfjGJ GdJYdjes, 1993)
* (3GdUa GdKGfj (B: (3LRA (B1 * (3GdUa GdNGeS (B: (3LRA (B1 + (3Odjd GdeYde LRA (B1 * (3GdUa GdSGOS (B: (3LRA (B1s