Rajeshkumar U. Sambhe,  Operational Guidelines for Six-Sigma Implementation: Survey of Indian Medium Scale Automotive Industries.   journal   = {International Journal of Economics and Management Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2016, vol. 109(1). 182 - 187
    [viewed 13 May 2021]. Available from: https://publications.waset.org/pdf/10003456.