Agayan, G., Voevodin, V., & Rovanov, S. (2013). Applicability of stratified models for solving problems of three-dimensional ultrasonic tomography. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie), 14(38), 533–542. Retrieved from https://en.num-meth.ru/index.php/journal/article/view/664