Feldman, R., B. Rosenfeld, R. Bar-Haim, and M. Fresko. “The Stock Sonar — Sentiment Analysis of Stocks Based on a Hybrid Approach”. Proceedings of the AAAI Conference on Artificial Intelligence, vol. 25, no. 2, Aug. 2011, pp. 1642-7, doi:10.1609/aaai.v25i2.18854.