Anjian Chen and  Joseph C. Chen,  Optimization of Surface Roughness in Additive Manufacturing Processes via Taguchi Methodology.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2018, vol. 136(4). 374 - 378
    [viewed 16 November 2019]. Available from: https://publications.waset.org/pdf/10008825.