Figueiredo, Celina, and Aquiles Queiroz. “Generating Interval and Semi-Order Extensions of Partially Ordered Sets”. Cadernos do IME - Série Informática 47 (October 18, 2022): 35–39. Accessed December 2, 2025. https://www.e-publicacoes.uerj.br/cadinf/article/view/70584.