(3fXGe GdHQOI (B: s (3PcQi eMeO Udi Gddg Ydjg h Sde (B/ s - (3HGcKjQ, Ydj CMeOs ((3GdbGgQI (B:s (3OGQ eUQ ddWHGYI,s, 1989)
Keywords: (3GdTYQ GdOjfjs; (3GdeOGFM GdfHhjIs