(3EHf jYjT GdfMhj (B553-643(3g` (B: s (3OQGSI (B/ s - (3fHgGf, YHO GdEdgs ((3OeTb (B:s (3GJMGO GdcJGH GdYQH,s, 1997)
Keywords: (3GddZhjhfs; (3GdJQGLes