COSTAKIS, G.; PARISSIS, I. Szemerédi’s theorem, frequent hypercyclicity and multiple recurrence. MATHEMATICA SCANDINAVICA, [S. l.], v. 110, n. 2, p. 251–272, 2012. DOI: 10.7146/math.scand.a-15207. Disponível em: https://www.mscand.dk/article/view/15207. Acesso em: 26 apr. 2024.