D. Cowan, P. Alencar, F. McGarry, C. de Lucena, и I. Nunes. 2010 IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology, стр. 528-532. IEEE Computer Society, (2010)
D. Marghescu, и M. Rajanen. Proceedings of IASTED International Conference on Databases and Applications (DBA 2005), стр. 181-186. IASTED/ACTA Press, (2005)