LE, Xuan Hung. Chromatic number, chromatic polynomials and chromatically unique for K2r. Dong Thap University Journal of Science, [S. l.], n. 30, p. 90–94, 2018. DOI: 10.52714/dthu.30.2.2018.556. Disponível em: https://dthujs.vn/index.php/dthujs/article/view/353. Acesso em: 8 sep. 2024.