Wen-Jye Shyr Chien-Fu Chiou Chia-Ming Lin Expansion augmented reality technology applied to the maintenance and diagnosis of equipment. 1-2 2021 ISPACS https://doi.org/10.1109/ISPACS51563.2021.9651035 conf/ispacs/2021 db/conf/ispacs/ispacs2021.html#ShyrCL21