Goncharsky, A., and S. Romanov. “Supercomputer Technologies in the Development of Methods for Solving Inverse Problems in Ultrasound Tomography”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie), vol. 13, no. 31, Mar. 2012, pp. 235-8, https://en.num-meth.ru/index.php/journal/article/view/515.