KLIMA, O.; SRBA, J. Matching Modulo Associativity and Idempotency is NP-Complete. BRICS Report Series, [S. l.], v. 7, n. 13, 2000. DOI: 10.7146/brics.v7i13.20140. Disponível em: https://tidsskrift.dk/brics/article/view/20140. Acesso em: 25 apr. 2024.