$ $. Rostislav Ivanovich Grigorchuk is laureate of the Leroy P. Steele Prize of 2015 year. Carpathian Mathematical Publications, [S. l.], v. 6, n. 2, p. 399–399, 2014. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/1374. Acesso em: 28 apr. 2024.