Khokhryakova(Bushueva), C.A., et al. “Dynamics of the Ferrofluid Layer Lying on a Liquid Substrate under the Action of Alternating Magnetic Fields”. Perm Federal Research Centre Journal, no. 3, Nov. 2017, pp. 86-91, https://journal-dev.icmm.ru/index.php/pscj/article/view/PSCJ2017n3p14.