Families of Disjoint Sets Colouring Technique and Concept of Common Face and Non-Common Face. The International Journal for Scientific Research, [S. l.], v. 4, n. 1, 2025. DOI: 10.59992/IJSR.2025.v4n1p12. Disponível em: https://vsrp.co.uk/index.php/ijsr/article/view/1212. Acesso em: 2 jul. 2026.