(3GdehJ ENJjGQG (B: s (3OQGSI faSjI GLJeGYjI ehSYI dXGgQI bJd GdfaS (B/ s - (3GdOHGZ, aNQjs ((3HjQhJ (B: s (3GdecJHI GdYUQjI, s, 1968)
Keywords: (3Yde GdfaS(B.s; (3GdeQVi(B.s; (3GdCeQGV GdYbdjI(B.s; (3GdEfJMGQ(B.s