(3GdbhGfjf GdLfGFjI GdYGeI hGdNGUI hbhGfjf GdUMGaI (B((3eY BNQ GdJYOjdGJ(B) s - (3hRGQI GdYOds ((3GdQHGW (B:s (3eWHYI GdSGMd (B,s, 1985)
Keywords: (3GdbGfhf GdLfGFjs; (3bGfhf GdUMGaIs