(3Tchi GdeLfj Ydjg aj GdfXGe GdLfGFj GdESdGej ebGQfG HGdfXGe GdLfGFj GdhVYj (B/s - (3ehSi, SYhO eMeOs ((3GdbGgQI (B:s [(3O(B. (3f(B.](3,s, 1990)
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
(3HHdjhLQGajI (B: (3U(B. 623-649.s
Keywords: (3GdLfGjGJ (B((3abg ESdGej(B)s; (3bGfhf GdELQGAGJ GdLfGFjIs -- (3eUQs; (3LQGFe GdGYJOGA Ydi GdCTNGUs