@book{
      international2003iaea,
      title={WWER-1000 Reactor Simulator},
      author={ },
      series={entity},
      number={21 },
      year={2003},
      isbn={ },
      url={/publications/6686/wwer-1000-reactor-simulator },
      publisher={INTERNATIONAL ATOMIC ENERGY AGENCY },
      address={Vienna}
    }