CAAY, Mark; ARUGAY, Esperanza. On Chromatic Number and Edge-Chromatic Number of the Ottomar Graph. American Scientific Research Journal for Engineering, Technology, and Sciences, Jordan, v. 16, n. 1, p. 98–107, 2016. Disponível em: https://asrjetsjournal.org/American_Scientific_Journal/article/view/1255. Acesso em: 12 sep. 2025.