1. A:) is worth a thousand words: how people attach sentiment to emoticons and words in tweets;M Boia;Social computing (socialcom),2013
2. Twitter mood predicts the stock market;J Bollen;Journal of Computational Science,2011
3. Investor sentiment and the near-term stock market;G W Brown;Journal of Empirical Finance,2004
4. How to forecast long-run volatility: regime switching and the estimation of multifractal processes;L E Calvet;Journal of Financial Econometrics,2004