1 https://techcrunch.com/2016/05/18/google-cardboard-platform-picks-up-steam-with-50m-app-downloads-to-date/
2 Google Data, Global, May 2016.
3 http://www.theverge.com/2016/1/27/10842438/google-shipped-5-million-cardboard-headsets
4 http://www.digitaltrends.com/cool-tech/gartner-predicts-vr-growth-over-2016-and-2017/
5 http://amexcorporate.com.ar/multitaskers/nota.php?id=316&cat=1