GROUPOIDS AND FIBONACCI NUMBERS THROUGH CYCLE COVERS. JP Journal of Algebra, Number Theory and Applications, [S. l.], v. 64, n. 5, p. 489–507, 2025. DOI: 10.17654/0972555525025. Disponível em: https://pphmjopenaccess.com/jpjana/article/view/2962. Acesso em: 5 jan. 2026.