Ruchkin, Vitaly, Sergey Eremin, Elena Zaitseva, Evgeny Zamylin, and Gennady Pechnikov. 2019. “Migration Processes and Socio-Economic Development of the Regions”. Amazonia Investiga 8 (24), 516-25. https://amazoniainvestiga.info/index.php/amazonia/article/view/1047.