BODNARCHUK, Yu. V.; PROKOF’EV, P. H. Locally nilpotent derivations and Nagata-type utomorphisms of a polynomial algebra. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 61, n. 8, p. 1011–1024, 2009. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3077. Acesso em: 5 dec. 2025.