ACETO, L.; FOKKINK, W. J.; GLABBEEK, R. J. van; INGÓLFSDÓTTIR, A. Nested Semantics over Finite Trees are Equationally Hard. BRICS Report Series, [S. l.], v. 10, n. 27, 2003. DOI: 10.7146/brics.v10i27.21795. Disponível em: https://tidsskrift.dk/brics/article/view/21795. Acesso em: 2 feb. 2023.