(3GdTYQ GdYQHi GdMOjK(B: (3HfjGJI hGHOGdGJgG (B: s (3eSGdI GdMOGKI (B/ s - (3eMeO HfjSs ((3GdeZQH (B: s (3OGQ JhHbGd ddfTQ , s, 1989)
Keywords: (3GdTYQ GdYQHi GdMOjKs; (3JGQjN hfbOs