CLAUSEN, S.-E. Optimizing the Evaluation of Calculus Expressions in a Relational Database System. DAIMI Report Series, [S. l.], v. 8, n. 97, 1979. DOI: 10.7146/dpb.v8i97.6513. Disponível em: https://tidsskrift.dk/daimipb/article/view/6513. Acesso em: 9 may. 2024.