(3CZQH GdMbGFb Yf YGde GdMjhGf (B/ s - (3YHO GdQMef, fGOjI aQjOs ((3GdbGgQI (B:s (3ecJHI EHf SjfG ddfTQ h GdJhRjY h GdJUOjQ,s, 1990)
Keywords: (3GdMjhGfGJs; (3GdMjhGfGJ GdOGLfgs; (3GdKOjGJs