(3GdEQTGO GdfaSj h GdJhLjg GdJQHhj h Gdegfj (B/ s - (3eQSj, SjO YHO GdMejOs ((3GdbGgQI (B:s (3ecJHI hgHI,s, 1987)
Keywords: (3GdEQTGO GdfaSjs; (3GdEQTGO GdJQHhjs; (3GdJhLjg GdJQHhjs