Pickalov, V., and A. Likhachev. “A Comparison of Algorithms for Spiral Tomography”. Numerical Methods and Programming (Vychislitel’nye Metody I Programmirovanie), vol. 5, no. 5, Sept. 2004, pp. 170-83, https://en.num-meth.ru/index.php/journal/article/view/128.