Khamzina, D., S. Goloviznin, O. Nogovitsina, A. Sarapulova, T. Aygumov, and E. Arishina. “Methodological Issues of Financial Analysis in Oil Construction Companies”. Amazonia Investiga, Vol. 8, no. 22, Sept. 2019, pp. 203-15, https://www.amazoniainvestiga.info/index.php/amazonia/article/view/306.