(3bjGS caGjI GdCOGA ddYGedjf GdeOfjjf HGdOhdI (B:s (3bhGYO GdbjGS hBKGQg GdhXjajI, GdQbGHI GdbVGFjI (B/s - (3YHO GdHGSW, eMeO aDGOs ((3GdEScfOQjI, eUQ (B:s (3OGQ GdacQ GdLGeYj,s, 1991)
(3HHdjhLQGajI (B: (3U(B. 513-516.s
Keywords: (3GdehXahfs -- (3hVY bGfhfj, bhGfjf, EdN(B.s -- (3eUQs; (3GdehXahfs -- (3JbOjQs -- (3eUQs