ANDREEV, A. E. Complexity of Nondeterministic Functions. BRICS Report Series, [S. l.], v. 1, n. 2, 1994. DOI: 10.7146/brics.v1i2.21668. Disponível em: https://tidsskrift.dk/brics/article/view/21668. Acesso em: 1 may. 2024.