1. Askitas, N., & Zimmerman, K. (2009). Google econometrics and unemployment forecasting. Applied Economics Quarterly, 55, 107–120.
2. Asur, S., & Huberman, B. (2010). Predicting the future with social media, arXiv: http://arXiv.org/abs/1003-5699 .
3. Barreira, N., Godinho, P., & Melo, P. (2013). Nowcasting unemployment rate and new car sales in south-western Europe with Google Trends. Netnomics, 14, 129–165.
4. Bollen, J., Mao, H., & Zeng, X. (2011). Twitter mood predicts the stock market. Journal of Computational Science, 1, 1–8.
5. Bongwon, S., Hong, L., Pirolli, P., & Chi, E. (2010). Want to be retweeted? Large scale analysis on factors impacting retweet in twitter network. In Proceedings of the IEEE international conference on social computing (pp. 177–184).