Goncharsky, A.V., S.Yu. Romanov, and S.Yu. Seryozhnikov. “Low-Frequency 3D Ultrasound Tomography: Dual-Frequency Method”. Numerical Methods and Programming (Vychislitel’nye Metody i Programmirovanie) 19, no. 58 (December 24, 2018): 479–495. Accessed April 28, 2024. https://en.num-meth.ru/index.php/journal/article/view/990.