(3GdEjeGf aj GdbQBf (B: s (3efgL LOjO aj YQV YfGUQ GdYbjOI aj GdESdGe (B/ s - (3YHO GdhGMO, eUWais ((3GdbGgQg (B:s (3OGQ GdUMhg,s, 1987)
Keywords: (3GdESdGes; (3CUhd GdOjf GdESdGejs; (3GdJhMjOs