Bharatendra Rai,  A Study of Classification Models to Predict Drill-Bit Breakage Using Degradation Signals.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2014, vol. 92(8). 2389 - 2392
    [viewed 20 January 2020]. Available from: https://publications.waset.org/pdf/9998907.