RIIS, Søren. A Complexity Gap for Tree-Resolution. BRICS Report Series, [S. l.], v. 6, n. 29, 1999. DOI: 10.7146/brics.v6i29.20098. Disponível em: https://tidsskrift.dk/brics/article/view/20098. Acesso em: 5 dec. 2025.