(3aj GdCOH GdebGQf (B: (3OQGSGJ aj fXQjI GdCOH hGdTYQ GdbUUj s - (3caGaj(B. (3eMeO YHO GdSdGes ((3OGQ GdfgVI GdYQHjIs (3HjQhJs, 1972)
Keywords: (3BOGHs; (3GOH ebGQfs