(3eTGgO TYQjI(B:(3ef MjGI GdYQH GdbOGei LeYgG hfSbgG hYdb YdjgG ceGd GdjGRLjs ((3HjQhJ(B:s (3OGQ GdLjds, 1987)
Keywords: (3GdTYQ GdYQHjs -- (3JGQjMs -- (3GdYUQ GdLGgdjs