(3WQjbI GdYed eY GdLeGYGJ eONd ddJcja hGdJfejI hGdJbhje hGdGTQGa (B/s - (3eGLOI ceGd YdGes ([S.N] : (3GdecJH GdLGeYi GdMOjK , s, 1990)