V. Carvalho, C. Lintzmayer, and M. Sambinelli. " New bound on the odd chromatic number of planar graphs with maximum degree at most 4", in Anais do X Encontro de Teoria da Computação, Maceió/AL, 2025, pp. 134-137, doi: https://doi.org/10.5753/etc.2025.9399.