Wen-Yuh Jywe and  Bor-Jeng Lin and  Jing-Chung Shen and  Jeng-Dao Lee and  Hsueh-Liang Huang and  Tung-Hsien Hsieh,  A Simple Low-Cost 2-D Optical Measurement System for Linear Guideways.   journal   = {International Journal of Industrial and Manufacturing Engineering}, [online]. World Academy of Science, Engineering and Technology.
    January 2014, vol. 85(1). 62 - 64
    [viewed 29 January 2020]. Available from: https://publications.waset.org/pdf/9997193.