(3fMd GdYSd (B: s (3efJLGJgG hahGFOgG GdWHjI (B/ s ((3OHj (B: s (3OGQ QGTO ddfTQ , s, 2000)
Keywords: (3GdfMd $1 (3JQHjI hEfJGL; GdYSd $1 (3ahGFO WHjI; efJLGJ GdfMd $1 (3GSJYeGdGJ; GdWH GdHOjd $1 (3GdYdGLGJ GdWHjYjIs