SURÓWKA, Wojciech. A discrete form of Jordan curve theorem. Annales Mathematicae Silesianae, [S. l.], v. 7, p. 57–61, 1993. Disponível em: https://trrest.vot.pl/ojsus/index.php/AMSIL/article/view/14245. Acesso em: 8 may. 2025.