VELLIS, V.; WU, J.-M. Sets of constant distance from a Jordan curve. Annales Fennici Mathematici, [S. l.], v. 39, n. 1, p. 211–230, 2014. DOI: 10.5186/aasfm.2014.3905. Disponível em: https://afm.journal.fi/article/view/135484. Acesso em: 25 nov. 2024.