Agayan, G., N. Vinogradov, A. Goncharsky, S. Ovchinnikov, and S. Romanov. “Diagnostics of Three-Dimensional Media by Synthesized-Aperture Methods”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie), vol. 8, no. 12, Apr. 2007, pp. 154-9, https://en.num-meth.ru/index.php/journal/article/view/257.