Silva, Agostinho da, Andreia Dionísio, and Luís Coelho. 2020. “Improving Industry 4.0 | A Service Science Perspective”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 52 (2):17-32. https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/11329.