DEKIMPE, Karel; DE ROCK, Bram; PENNINCKX, Pieter. The $R_{\infty}$ property for infra-nilmanifolds. Topological Methods in Nonlinear Analysis, [S. l.], v. 34, n. 2, p. 353–373, 2009. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.2009.047. Acesso em: 13 may. 2025.