(3JhbjQ GdeUWai Ud Gddg YdjI hSde (B/s - (3YHOg ZGdH GMeO YjSis ((3HjQhJ (B:s (3OGQ GdLjd,s, 1987)
Keywords: (3GdGOYjI hGdGhQGOs; (3GdSjQI GdfHhjIs