Kacprzyk, Janusz, and Slawomir Zadrozny. “Computing With Words, Protoforms and Linguistic Data Summaries: Towards a Novel Natural Language Based Data Mining and Knowledge Discovery Tools”. Journal of Automation, Mobile Robotics and Intelligent Systems 8, no. 3 (January 22, 2014): 52–58. Accessed April 30, 2025. https://www.jamris.org/index.php/JAMRIS/article/view/321.