(3QMdI aj GdTYQ Gdjefj bOjeg h MOjKg (B/ s - (3GdHQOhfj, YHO Gddgs ((3OeTb (B:s (3OGQ GdYde ddWHGYI h GdfTQ,s, 1977)
Keywords: (3GdTYQ GdYQHjs; (3GdYUQ GdMOjKs; (3Gdjefs