1. http://www.digi-capital.com/news/2016/01/augmentedvirtual-reality-revenue-forecast-revisedto-hit-120-billion-by-2020/#.WJdeBLYrJWM.
2. http://www.ptc.com/cad-software-blog/2016-the-year-for-augmented-reality-in-the-enterprise.
3. http://www.thewrap.com/mixed-year-mobile-ar-drive-108-billion-vrar-market-2021-guest-column/.
4. A Survey of Augmented Reality
5. Exploring the Benefits of Augmented Reality Documentation for Maintenance and Repair