GRIGORYEVA, E. элементарно. проект байкал, Irkutsk, Russian Federation, v. 15, n. 56, p. 59–59, 2018. DOI: 10.7480/projectbaikal.56.1322. Disponível em: https://projectbaikal.com/index.php/pb/article/view/1322. Acesso em: 6 май. 2024.