1. Hadas E. 2013 A prediction: Bitcoin is doomed to fail. The New York Times . See http://dealbook.nytimes.com/2013/11/27/a-prediction-bitcoin-is-doomed-to-fail (accessed: 1 December 2013).
2. The Blackstone Group L P. 2014 Byron Wien announces predictions for ten surprises for 2014; 2014. Press release. See http://www.blackstone.com/news-views/press-releases/details/byron-wien-announces-predictions-for-ten-surprises-for-2014 (accessed: 7 December 2013).
3. Fontevecchia A. 2013 Winklevoss twins say Bitcoin market to hit $400B urge regulators not to push innovation to China. See http://www.forbes.com/sites/afontevecchia/2013/11/12/winklevoss-twins-say-bitcoin-market-to-hit-400b-urge-regulators-not-to-push-innovation-to-china/ (accessed: 1 December 2013). Forbes.
4. Data from blockchain.info. 2013. See https://blockchain.info/charts (accessed: 1 December 2013).