(3eSCdI GdQb aj GaQjbjG (B:s (3HMhK hOQGSGJ (B/s ((3JhfS (B:s (3GdefXeI GdYQHjI ddJQHjI h GdKbGaI h GdYdhe ,s, 1989)
Keywords: (3GaQjbjG s; (3GdQb s; (3eSCdIs