(3eYGedI GdESJKeGQGJ GdCLfHjI ai eUQ (B/s - (3EHQGgje TMGJI(B.s ((3GdbGgQI (B:s (3OGQ GdfgVI GdYQHjI,s, 1972)
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
Keywords: (3GdESJKeGQGJ GdCLfHjIs -- (3eUQ s; (3GdGSJKeGQ s -- (3eUQ s