(3ef CbhGd GdbGFO aj bGOSjI UOGe (B/ s - (3UOGe MSjf , QFjS GdLeghQjI GdYQGbjI , (B1979(3, s; (3WhGdHg, MSf eMeOs ((3HZOGO (B:s (3hRGQI GdKbGaI h GdEYdGe,s, 1981)
Keywords: (3GdNWH GdSjGSjIs