SCHWARTZ, Richard Evan. Continued Fractions and the Four Color Theorem. Journal of Experimental Mathematics, [S. l.], v. 1, n. 1, p. 149–168, 2025. Disponível em: https://jexpmath.org/index.php/jem/article/view/Vol-1Issue-1Paper-7. Acesso em: 1 jun. 2026.