Volker Wilhelm THÜREY. Questions on Coloring. Research Highlights in Mathematics and Computer Science Vol. 3, [S. l.], p. 175–185, 2022. DOI: 10.9734/bpi/rhmcs/v3/3790C. Disponível em: https://stm.bookpi.org/RHMCS-V3/article/view/9177. Acesso em: 9 jun. 2026.