(3TQM GdGTYGQ GdSJI aj GdLGgdjI ddhRjQ GHj HcQ YGUe Hf GjhH GdHWdjhSj (B/ s - (3YhGO , fGUja SdjeGf s ((3GdYQGb (B: s (3hRGQI GdKbGaI hGdafhf , s, 1979)
Keywords: (3GdTYQ GdYQHj s -- (3JGQjN hfbO s -- (3GdYUQ GdLGgdj s