(3OQGSGJ ai Yde GdELQGe hGdYbGH (B/s - (3fHjg UGdM s; (3,s ((3CHhOjS (B:s (3ecJHI OGQ GdacQ,s, 1999)
(3HHdjhLQGajG(B: (3UaMGJ(B225-228.s
(3GdfU HGddZI GdYQHjIs
Keywords: (3Yde GdELQGe s; (3GdbGfhf GdLfGFi s