(3GdLOjO aj GdfbV GdLfGFj (B:s (3bGfhf GdYbhHGJ(B-(3bGfhf GdELQGAGJ GdLfGFjI ef SfI (B1984 (3MJi SfI (B1988 /s - (3eQGO, YHO GdaJGM s ((3GdEScfOQjI, eUQ (B:s (3GdecJH GdYQHj GdMOjK, s, 1989)
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B. s
Keywords: (3bGfhf GdYbhHGJ s -- (3eUQ s; (3GdbGfhf GdLfGFjs -- (3eUQs; (3bGfhf GdELQGAGJ GdLfGFjI s -- (3eUQ s