(3OQGSGJ ai Yde GdGLJeGY (B: (3fXQjGJ hJWHjbGJ (B/ s - (3eMeO YGWa ZjKs ((3GdbGgQI (B: s (3OGQ GdfgVI GdYQHjI ddWHGYI hGdfTQ , s, 1985)
Keywords: (3GdeLJeYs; (3GdGfMQGas; (3GdGLJeGY, Ydes; (3GdJcGed GdKbGais