Khomyak, Y., I. Naumenko, V. Zheglova, and V. Popov. “Minimizing the Mass of a Flat Bottom of Cylindrical Apparatus”. Eastern-European Journal of Enterprise Technologies, vol. 2, no. 1 (92), Mar. 2018, pp. 42-50, doi:10.15587/1729-4061.2018.126141.