PETROV, P. Formal Neighbourhoods and Formal Models of Non-Degenerate Arcs. Proceedings of the Bulgarian Academy of Sciences, Sofia, Bulgaria, v. 75, n. 12, p. 1707–1714, 2022. DOI: 10.7546/CRABS.2022.12.01. Disponível em: https://proceedings.bas.bg/index.php/cr/article/view/209. Acesso em: 5 feb. 2023.