(3GdOQQ GdefKhQ aj GdJaSjQ HGdeCKhQ (B/s - (3GdLdGd GdSjhWj, YHO GdQMef Hf CHj HcQ Hf eMeO,s 849-911 (3gLQjG(B.s; (3GdegOj , YHO GdQRGbs ((3HjQhJ(B:s (3OGQ GMjGA GdJQGK GdYQHj ,s, 1957)
Keywords: (3GdbQBfs -- (3JaGSjQ eCKhQIs