(3Gef GdceHjhJQ hGdbGfhf (B/ s - (3GdSYjO, YHO Gddg YHO GdQGRb eSYhOs ((3YeGf (B:s (3OGQ GdVjGA ddfTQ,s, 1990)
Keywords: (3GdESdGes; (3GdWH GdfaSjs