(3GdceHjhJQ ai WH GdGSfGf (B/ s - (3YeGQ GdYGfis; (3TQja GdUHGZs; (3NGdO NQWHjds ((3HjQhJ (B: s (3OGQ GdQGJH GdLGeYjI , s, 1991)
Keywords: (3GdMGSHGJ GdGdcJQhfjIs; (3WH GdGSfGfs