CHAVEZ, Angel; OSTERGREN, Gwen. Discrete Approximation of Coloring the Plane. The PUMP Journal of Undergraduate Research, [S. l.], v. 2, p. 20–29, 2019. DOI: 10.46787/pump.v2i0.227. Disponível em: https://journals.calstate.edu/pump/article/view/227. Acesso em: 3 jul. 2024.