ABD AL-MAJEED, Saran Akram. Null Values Treatment in Distributed Databases. Iraqi Journal for Computers and Informatics, [S. l.], v. 40, n. 1, p. 55–64, 2002. DOI: 10.25195/ijci.v40i1.226. Disponível em: https://ijci.uoitc.edu.iq/index.php/ijci/article/view/226. Acesso em: 18 jun. 2026.