ERIKSSON, Salomé; RÖGER, Gabriele; HELMERT, Malte. Unsolvability Certificates for Classical Planning. Proceedings of the International Conference on Automated Planning and Scheduling, [S. l.], v. 27, n. 1, p. 88–97, 2017. DOI: 10.1609/icaps.v27i1.13818. Disponível em: https://ojs.aaai.org/index.php/ICAPS/article/view/13818. Acesso em: 25 may. 2026.