(3TQM GdebGUO (B/s - (3GdJaJGRGfi , eSYhO Hf YeQ Hf YHOGddg s ((3HjQhJ (B:s (3YGde GdcJH,s, 1989)
Keywords: (3GdaQb GdGSdGejIs; (3Gdabg GdGSdGei s