(3GdEfMQGaGJ GdLfSjI (B: s (3HMK faSj Ydej dXGgQI GdEfMQGa h GdTPhP GdLfSj YfO GdQLd h GdeQCI (B/ s - (3eQOGf, LeGd eUWais ((3HZOGO (B:s (3ecJHI GdfgVI,s, 1990)
Keywords: (3GdLfSs; (3GdEfMQGa GdLfSjs; (3GdTPhP GdLfSjs