WASET
    Youngji Yoo and  Cheong-Sool Park and  Jun Seok Kim and  Young-Hak Lee and  Sung-Shick Kim and  Jun-Geol Baek,  Clustering Mixed Data Using Non-normal Regression Tree for Process Monitoring.   journal   = {International Journal of Computer and Information Engineering}, [online]. World Academy of Science, Engineering and Technology.
    December 2012, vol. 72(12). 1699 - 1703
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/978.