(3CYeGd GdbGVj GdJj JMhR MLjI GdCeQ GdebVj hVhGHW MLjJgG (B: s (3OQGSGJ Mhd fWGb MLjI GdCeQ aj GdehGO GdeOfjI hGdJLGQjI (B/ s - (3RZdhd, CMeO eGgQ s ((3GdbGgQI (B: s (3OGQ GdfgVI GdYQHjI, s, 1990)
(3HHdjhLQGajI (B: (3U(B. 481-462. s
Keywords: (3GdEKHGJ (B((3bGfhf(B) s -- (3eUQ s; (3bGfhf GdELQGAGJ GdeOfjI hGdJLGQjI s -- (3eUQ s