1. A. Budihardjo, J. W. Grzymala-Busse, An overview of the learning program LERS_LB 2.5. Report TR-90–4, Department of Computer Science, University of Kansas, 1990
2. C.- C. Chan, J. W. Grzymala-Busse, Rough-set boundaries as a tool for learning rules from examples. Proc. of the ISMIS-89, 4th International Symposium on Methodologies for Intelligent Systems, Charlotte, North Carolina, October
12–14, 1989, 281–288
3. C.- C. Chan, J. W. Grzymala-Busse, On the Attribute Redundancy and the Learning Programs ID3, PRISM, and LEM2. Report TR-91–14, Department of Computer Science, University of Kansas, 1991
4. J. W. Grzymala-Busse, L. Yue, The Machine Learning Programs LEM2 and LERS_LB2 based on Single Coverings and Blocks. Report TR-90–3, Department of Computer Science, University of Kansas, 1990
5. R. S. Michalski, A theory and methodology of inductive learning, In Machine Learning. R. S. Michalski, J. G. Carbonell, T. M. Mitchell (eds), Tioga Publ. Co. 1983