1. Virtual Reality (VR) Market Research Report - Global Forecast to 2027,2018
2. Goldman Sachs report on VR opportunities 2016: https://slidelegend.com/report-on-virtual-reality-goldman-sachs_59b3bd291723ddf2725ef700.html
3. Opaque Media, https://www.opaque.media
4. www.esa.int/Our_Activities/Preparing_for_the_Future/Discovery/Reality_to_the_rescue, ESA, July 2017.
5. Serious games and gamification for mental health: current status and promising directions;Fleming;Front. Psychiatry,2017