(3dfacQ aj hSGFd GdEYdGe (B/s - (3CQehf, h ejTGd eWdGQOs; (3GdceHj eMeO Ydjs ((3JhfS (B:s (3GdefXeI GdYQHjI ddJQHjI h GdKbGaI h GdYdhe ,s, 1989)
Keywords: (3GdEYdGes; (3hSGFd GdEYdGe s