SETEKLEV, Sigurd; ØSTVÆR, Paul Arne. Homotopy theory of cyclic presheaves. Mathematica Scandinavica, Berkeley, CA, United States, v. 107, n. 1, p. 30–42, 2010. DOI: 10.7146/math.scand.a-15141. Disponível em: https://journals.msp.org/mscand/article/view/556. Acesso em: 24 jul. 2026.