Резуненко, В. А. “The Field Calculation of the Electrical Current Coil Scattered by Spiral Conductive Spherical Disk”. Visnyk of V.N. Karazin Kharkiv National University, Series “Radio Physics and Electronics”, no. 24, 1, pp. 41-48, https://periodicals.karazin.ua/radiophysics/article/view/6383.