(3TQM GdYbjOI GdWMGhjI (B: s (3Mbbg(B/(3LeGYI ef GdYdeGA (B-(3GNQGL(B/(3eMeO fGUQ GdOjf GdGdHGfj (B/ s ((3HjQhJ (B: s (3GdecJH GdGSdGej , s, 1988)
Keywords: (3GdYbjOI hGdEjeGfs