1. Bargiela A, Pedrycz W (2002) Granular computing: an introduction. Kluwer Academic Publishers, Boston
2. Bargiela A, Pedrycz W (2008) Toward a theory of granular computing for human-centered information processing. IEEE Trans Fuzzy Syst 16:320–330
3. Gu SM, Wu WZ, Chen HT (2007) A classification approach of granules based on variable precision rough sets. In: 6th IEEE International Conference on cognitive informatics, pp.163–168
4. Gu SM, Zhu SX, Ye QH (2008) An approach for constructing hierarchy of granules based on fuzzy concept lattices. In: 5th International Conference on fuzzy systems and knowledge discovery, pp.679–684
5. Hu QH, Liu JF, Yu DR (2008) Mixed feature selection based on granulation and approximation. Knowl Based Syst 21:294–304