ROZHKO, Mikhail Viktorovich; RUBTZOV, Vladimir Anatolyevich; GABDRAKHMANOV, Niyaz Kamilevich. Positioning of the Republic of Mari El in Volga Federal District. Revista Publicando, "Quito, EC", v. 4, n. 13 (3), p. 905–915, 2017. Disponível em: https://revistapublicando.org/revista/index.php/crv/article/view/1015. Acesso em: 8 jan. 2025.