Nasyrova, V. I., S. V. Salmina, G. N. Kaigorodova, A. A. Mustafina, and G. K. Pyrkova. “Tax Competition Between Regions of Russia and Its Indicators”. Amazonia Investiga, vol. 7, no. 14, June 2018, pp. 350-5, https://amazoniainvestiga.info/index.php/amazonia/article/view/528.