(3fXGe GdVQGFH GdeUQj (B:s (3GdVQjHI Ydi EjQGO QAhS GdCehGd GdefbhdI (B/s - (3ceGd YHOGdQMef GdLQas ((3GdbGgQI (B: s (3eWHYI GdTHcTj HGdCRgQ ,s, 1949)
. 569-543 (3HHdjhLQGajG(B: (3UaMGJ(B.s
Keywords: (3GbJUGOs; (3GdVQGFHs