(3GdeLehYI GdcGedI deDdaGJ GdGSJGPYHGS eMehO GdYbGO(B:s - (3GdYbGO,YHGS eMehO s ((3HjQhJ (B:s (3OGQ GdcJGH GddHfGfj ,s, 1980)
Keywords: (3GdQLGd (B-(3JQGLe s