Regulska, P., et al. “Acoustic and Magnetic Properities Dependence of Restructuring Differents Magnetic Fluids Subjected to External Magnetic Fluid”. Archives of Acoustics, vol. 31, no. 4(S), Jan. 2014, pp. 153-8, https://acoustics3.ippt.pan.pl/index.php/aa/article/view/1336.