M. Anand, S. Bowers, T. McPhillips, и B. Ludäscher. EDBT '09: Proceedings of the 12th International Conference on Extending Database Technology, стр. 958--969. New York, NY, USA, ACM, (2009)
O. Arieli, M. Denecker, B. Nuffelen, и M. Bruynooghe. Paraconsistent Computational Logic, том 95 из Datalogiske Skrifter, стр. 51-65. Roskilde University, Roskilde, Denmark, (2002)
J. Beach, S. Pramanik, и J. Beaman. Advances in Computer Methods for Systematic Biology:
Artificial Intelligence, Databases, Computer
Vision, глава 15, Johns Hopkins University Press, Baltimore, (1993)