CHUNG, L.; DEMAINE, E. D. Celeste is PSPACE-hard: Discrete and Computational Geometry, Graphs, and Games. Thai Journal of Mathematics, [S. l.], v. 21, n. 4, p. 671–686, 2023. Disponível em: https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/1538. Acesso em: 9 may. 2024.