1. Keet, C. M.. (2008). A formal theory of granularity. Ph.D. thesis, KRDB Research Centre, Faculty of Computer Science, Free University of Bozen-Bolzano, Italy.
2. Lin, T. Y.. (1997). Granular computing: From rough sets and neighborhood systems to information granulation and computing in words. In Proceedings of European congress on intelligent techniques and soft computing (pp. 1602–1606). Aachen: Germany.
3. Pedrycz, W., Skowron, A., & Kreinovich, V. (Eds.). (2008). Handbook of granular computing. Chichester: Wile.
4. Slezak, D., Glick, R., Betlinski, P., & Synak, P. (2018). A new approximate query engine based on intelligent capture and fast transformations of granulated data summaries. Journal of Intelligent Information System, 50(2), 385–414.
5. Yao, Y. Y.. (2008). Granular computing: Past, present and future. In Proceedings of 2008 IEEE international conference on granular computing. Hangzhou: China