1. Ahn D, Adafre SF, Rijke M (2005) Extracting temporal information from open domain text: a comparative exploration, J Digit Inf Manag, p 3
2. Allen JF (1983) Maintaining knowledge about temporal intervals. Commun ACM 26(11):832–843
3. Amigó E, Artiles J, Li Q, Ji H (2011) An evaluation framework for aggregated temporal information extraction. In: SIGIR-2011 workshop on entity-oriented search
4. Bartak R, Morris R, Venable K (2013) An introduction to constraint-based temporal reasoning, synthesis lectures on artificial intelligence and machine learning. Morgan & Claypool, San Rafael
5. Bethard S (2013) Cleartk-timeml: A minimalist approach to tempeval 2013. In: Second joint conference on lexical and computational semantics (*SEM): proceedings of the seventh international workshop on semantic evaluation (SemEval 2013), vol 2. Association for Computational Linguistics, Atlanta, pp 10–14