(3eMGSHI TQcGJ GdCehGd aj CUhdgG GdYdejI h GdYedjI (B/ s - (3GdNWjH, NGdOs; (3GdQRb, UGdMs ((3YeGf (B:s (3OGQ GdacQ ddfTQ hGdJhRjY,s, 1991)
Keywords: (3GdeMGSHIs; (3eMGSHI GdTQcGJs