(3GdacQ GdJQHhi YfO GHf SMfhf hGdbGHSi (B/ s - (3YHOGdGejQ R(B. (3TeS GdOjfs; (3YHOGdMejO aGjOs ((3HjQhJ (B:s (3GdTQcI GdYGdejI ddcJGH , s, 1990)
Keywords: (3GdJQHjI s; (3GdacQ GdYQHi GdGSdGei s; (3GdJQHjI GdabgjI s; (3GdeYdejfs