PEKEC, A. Hypergraph Optimization Problems: Why is the Objective Function Linear?. BRICS Report Series, [S. l.], v. 3, n. 50, 1996. DOI: 10.7146/brics.v3i50.20053. Disponível em: https://tidsskrift.dk/brics/article/view/20053. Acesso em: 25 apr. 2024.