(3GdbGfhf GdOhdj GdEfSGfj (B: s (3OQGSI ebGQfI HGdTQjYI GdESdGejI (B/s - (3YHO GdZfj eMehOs (b, 1991)
. 209-200 (3HHdjhLQGajG(B: (3UaMGJ(B.s
(3GdfU HGddZI GdYQHjIs
Keywords: (3Mbhb GdCfSGfs -- (3GdESdGes; (3GdbGfhf GdOhdj GdYGes