(3QSe GdeUMa GdYKeGfj hChgGe GdeSJTQbjf aj bQGAGJ GdbQBf GdcQje (B:s (3OhGaYgG hOGaYgG (B/s - (3TdHj, YHO GdaJGM ESeGYjds ((3LOI, GdSYhOjI (B:s (3OGQ GdefGQI,s, 1990)
(3cTGa (B: (3U(B. 147-151.s
(3HHdjhLQGajI (B: (3U(B. 137-142.s
Keywords: (3GdbQBfs -- (3OaY eWGYfs; (3GdbQBfs -- (3JLhjOs; (3GdeUGMa GdYKeGfjIs; (3QSe GdeUGMas