1. Implementation of the algorithm for approximate classification;Fila,1983
2. An Approximate Concept Learning, Bericht 81–7. Berlin;Konrad,1981
3. Information systems, theoretical foundations;Pawlak;Information Systems,1981
4. Rough sets;Pawlak;Informational Journal of Information and Computer Sciences,1982
5. Classification of objects by means of attributes;Pawlak;International Journal of Information and Computer Sciences,1983