KOTOV, V. E.; STARKOVA, S. A.; VIRBITSKAITE, I. B. On Varieties of Density and Crossing Properties for Event Structures. Computing and Informatics, [S. l.], v. 14, n. 6, p. 611–622, 2012. Disponível em: https://www.cai.sk/ojs/index.php/cai/article/view/294. Acesso em: 1 may. 2025.