SHKOLNIKOV, Mikhail. Planar tropical caustics: trivalency and convexity. Serdica Mathematical Journal, Sofia, Bulgaria, v. 51, n. 1, p. 47–72, 2025. DOI: 10.55630/serdica.2025.51.47-72. Disponível em: https://serdica.math.bas.bg/index.php/serdica/article/view/159. Acesso em: 11 oct. 2026.