Ptolemaic spaces and their generalizations. Letters in Nonlinear Analysis and its Applications, [S. l.], v. 2, n. 1, p. 28–34, 2024. DOI: 10.66147/lnaa.20242127. Disponível em: https://lettersinnonlinearanalysis.com/index.php/lnaa/article/view/v2n1a05. Acesso em: 24 jul. 2026.