BRADFIELD, J. C. Fixpoint Alternation: Arithmetic, Transition Systems, and the Binary Tree. BRICS Report Series, [S. l.], v. 5, n. 53, 1998. DOI: 10.7146/brics.v5i53.19499. Disponível em: https://tidsskrift.dk/brics/article/view/19499. Acesso em: 26 apr. 2024.