Samoilenko, A. M., et al. “Oleksandr Andriiovych Boichuk (on His 70th Birthday)”. Ukrains’kyi Matematychnyi Zhurnal, vol. 72, no. 7, July 2020, pp. 1011-2, https://doi.org/10.37863/umzh.v72i7.6189.