(3edGeM GdJhLjg GdGSdGei ddYdhe dOi YdeGA GdeSdejf (B/ s - (3YHOGdMce YHOGddWja GdUYjOis ([S.N] : (3eQcR GdcJGH ddfTQ , s, 1991)
Keywords: (3GdTQjYI GdGSdGejIs