COURCELLE, Bruno; WALUKIEWICZ, Igor. Monadic Second-Order Logic, Graphs and Unfoldings of Transition Systems. BRICS Report Series, [S. l.], v. 2, n. 44, 1995. DOI: 10.7146/brics.v2i44.19945. Disponível em: https://tidsskrift.dk/brics/article/view/19945. Acesso em: 19 dec. 2025.