(3GdESJYeGQ aj LfhH TQbj BSjG (B/ s - (3CHh LGHQ, aGjR UGdMs ((3YeGf (B:s (3OGQ GdHTjQ ddfTQ h GdJhRjY,s, 1991)
Keywords: (3BSjGs; (3JGQjN BSjGs; (3GdJGQjN GdMOjKs