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2012. Potentials of a spherical segment and electrostatic charge in the presence a cone and sectional sphere. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics. 1030 (Nov. 2012), 25–37. DOI:https://doi.org/10.26565/2221-5646-2012-1030-03.