Thermal neutron intensity measurement with fission chamber in current, pulse and Campbell modesShakir Zeinalov, Olga Sidorova, Pavel Sedyshev, Valery Shvetsov, Youngseok Lee and Uk-Won NamEPJ Web Conf., 231 (2020) 05009DOI: https://doi.org/10.1051/epjconf/202023105009