E. Ellmer, и D. Merkl. Seventh International Workshop on Database and Expert Systems Applications, DEXA '96, стр. 320-325. IEEE Computer Society, (1996)
M. Nurminen, A. Honkaranta, и T. Kärkkäinen. Workshop on Text Data Mining and Management (TDMM), IEEE 23rd Int. Conf. on Data Engineering, стр. 760-769. IEEE, (2007)