(3GdESdGe dG GdTjhYjI (B/s - (3ESeGYjd eXgQs ((3GdbGgQI (B:s (3OGQ GdfgVI GdYQHjI,s, 1961)
(3jTJed Ydi EQLGYGJ HHdjhLQGajI(B.s
(3GdfU HGddZI GdYQHjIs
Keywords: (3GdESdGes; (3GdTjhYjIs; (3GdfXe GdSjGSjIs