VASSALLO, Salvatore. On the Minimal Annulus of Triangles and Parallelograms. Armenian Journal of Mathematics, Yerevan, Armenia, v. 15, n. 1, p. 1–15, 2023. DOI: 10.52737/18291163-2023.15.1-1-15. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/817. Acesso em: 3 apr. 2025.