(3MSf GdXf HGddg (B/ s - (3GHf GHj GdOfjG s; (3TGfhNI , YHOGdMejO s ((3GdSYhOjI (B: s (3OGQ GdKbI ddfTQ hGdJhRjY , s, 1990)
Keywords: (3GdMOjK s -- (3QhGjI s