(3GdYGde GdESdGej h GdESJYeGQ GdSjGSj h GdELJeGYj h GdKbGaj (B/ s - (3GdLfOj, CfhQs ((3HjQhJ (B:s (3OGQ GdcJGH GddHfGfj,s, 1979)
Keywords: (3GdJGQjN GdESdGejs; (3GdYQHs