Smooth 2-homogeneous polynomials on the plane with a hexagonal norm. Extracta Mathematicae, [S. l.], v. 37, n. 2, p. 243–259, 2022. DOI: 10.17398/2605-5686.37.2.243. Disponível em: https://revista-em.unex.es/index.php/EM/article/view/2605-5686.37.2.243.. Acesso em: 26 jun. 2025.