1. Parquet.io homepage 〈www.parquet.io〉(last visited 04/02/2014)
2. A. Akbik, A. Löser, Kraken: N-ary facts in open information extraction, in: Joint Workshop on Automatic Knowledge Base Construction and Web-scale Knowledge Extraction, AKBC-WEKEX ׳12.
3. A. Akbik, L. Visengeriyeva, P. Herger, H. Hemsen, A. Löser, Unsupervised discovery of relations and discriminative extraction patterns, in: COLING, 2012, pp. 17–32.
4. A. Akbik, L. Visengeriyeva, J. Kirschnick, A. Löser, Effective selectional restrictions for unsupervised relation extraction, in: IJCNLP, 2013.
5. Maintaining knowledge about temporal intervals;Allen;Commun. ACM,1983