(3QYGjI GdCMOGK aj GdbhGfjf hGdJTQjYGJ GdYQHjI (B/s - (3GdeRZfj, QVG(B.s ((3GdQjGV (B:s (3GdeQcR GdYQHj ddOQGSGJ GdCefjI hGdJOQjH, OGQ GdfTQ,s, 1990)
(3HHdjhLQGajI (B: (3U(B. 209-213.s
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
Keywords: (3GdCMOGKs -- (3hVY bGfhfj, bhGfjf, EdN(B.s -- (3GdHdGO GdYQHjIs