(3GdbGfhf GdOhdj GdNGU(B.s (3GdcJGH GdChd,s (3aj GdLfSjI heQcR GdCLGfH (B/s - (3GdbUHj, YUGe GdOjfs ((3GdbGgQI (B:s (3ecJHI SjO hgHI,s, 1986)
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
Keywords: (3GdLfSjIs -- (3bhGfjf hJTQjYGJs; (3GdCLGfHs -- (3hVY bGfhfj, bhGfjf, EdN(B.s; (3GdbGfhf GdOhdj GdNGUs