(3UfGYI GdTYQ (B/ s - (3gjhR, JjOs; (3eXaQ, ejs ((3HZOGO (B:s (3hRGQI GdKbGaI h GdEYdGe (B- (3OGQ KbGaI GdCWaGd,s, 1987)
Keywords: (3GdTYQ GdYQHjs; (3GdfbO GdGOHjs