COSTAKIS, George; PARISSIS, Ioannis. Szemerédi’s theorem, frequent hypercyclicity and multiple recurrence. Mathematica Scandinavica, Berkeley, CA, United States, v. 110, n. 2, p. 251–272, 2012. DOI: 10.7146/math.scand.a-15207. Disponível em: https://journals.msp.org/mscand/article/view/490. Acesso em: 24 jul. 2026.