(3cJGH GdVYaGA hGdeJQhcjf (B/s - (3GHf GdLhRj, YHO GdQMef Hf Ydj Hf eMeO,s 508-597 (3g`(B.s; (3GdbGVj, YHO Gddgs ((3HjQhJ (B:s (3OGQ GdcJH GdYdejI,s, 1950)
Keywords: (3GdMOjKs -- (3GdLQM hGdJYOjds -- (3GdVYaGAs