GARTSIDE, P. Proofs Without Words: Series 2. Pittsburgh Interdisciplinary Mathematics Review, Pittsburgh, v. 2, p. 142, 2024. DOI: 10.5195/pimr.2024.46. Disponível em: https://pimr.pitt.edu/pimr/article/view/46. Acesso em: 17 jan. 2025.