Sergazina, Karlygash T. “Procopius Lupkin and Ivan Suslov: Saints, Blasphemers, False Christs, Anti-Christs?”. State, Religion and Church, vol. 35, no. 2, Mar. 2017, pp. 105-22, https://doi.org/10.22394/2073-7203-2017-35-2-105-122.