HERTZ, Alain; RIES, Bernard. A note on r-equitable k-colorings of trees. Yugoslav Journal of Operations Research, [S. l.], v. 24, n. 2, p. 293–298, 2014. DOI: 10.2298/YJOR130704039H. Disponível em: https://yujor.erc.fon.bg.ac.rs/index.php/yujor/article/view/397. Acesso em: 26 aug. 2025.