(3cJGH GdeJMGHjf aj Gddg (B/s - (3bOGeI, YHO Gddg Hf CMeO GdebOSjs 541-620 (3gLQjs; (3EHQGgje, eLOj GdSjOs ((3GdbGgQI(B:s (3ecJHI GdbQBf,s, 1987)
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
Keywords: (3GdMOjKs -- (3LhGeY afhfs