Patsegon, N. F., and PotseluievS. І. “The Volumetric Parametric Resonance in Magnetizable Medium”. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics, Vol. 81, Dec. 2015, pp. 20-35, doi:10.26565/2221-5646-2015-81-03.