(3BdGe GdQCS (B: s (3GdUOGY h GdTbjbI (B/ s ((3HjQhJ (B:s (3GdTQcI GdTQbjI ddeWHhYGJ,s, 1988)
Keywords: (3GdUOGYs; (3GdUOGY GdfUajs