A Combined Approach for Extracting Financial Instrument-Specific Investor Sentiment from Weblogs. - Achim Klein; Olena Altuntas; Martin Riekert; Velizar Dinev (Wirtschaftsinformatik, 2013)

Accurate Retrieval of Corporate Reputation from Online Media Using Machine Learning. - Achim Klein; Martin Riekert; Velizar Dinev (FedCSIS, 2019)