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