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Daas, P. and Braaksma, B. and Aly, R.B.N. and von Engelhardt, J. and Hiemstra, D. and Zurita Milla, R. (2016) Big Data Masterclass and DataCamp 2015. Technical Report 2016-15 Centraal Bureau voor de Statistiek, Den Haag.
de Graaff, V. and de By, R.A. and van Keulen, M. (2016) Automated semantic trajectory annotation with indoor point-of-interest visits in urban areas. In: Proceedings of the 31st ACM Symposium on Applied Computing, ACM SAC 2016, 4-8 April 2016, Pisa, Italy. pp. 552-559. ACM. ISBN 978-1-4503-3739-7


de Graaff, V. (2015) Geosocial Recommender Systems. PhD thesis, Univ. of Twente. CTIT Ph.D. Thesis Series No. 15-381 ISBN 978-90-365-3977-7
de Graaff, V. and Pfoser, D. and van Keulen, M. and de By, R.A. (2015) Spatiotemporal Behavior Profiling: A Treasure Hunt Case Study. In: Proceedings of Web and Wireless Geographical Information Systems, W2GIS 2015, 21-22 May 2015, Grenoble, France. pp. 143-158. Lecture Notes in Computer Science 9080. Springer. ISBN 978-3-319-18250-6
de Graaff, V. and van de Venis, A. and van Keulen, M. and de By, R.A. (2015) Generic knowledge-based analysis of social media for recommendations. In: Proceedings of the 2nd Workshop on New Trends in Content-Based Recommender Systems (CBRecSys 2015), 20 Sep 2015, Vienna, Austria. ACM.


de Graaff, V. and de By, R.A. and van Keulen, M. and Flokstra, Jan (2013) Point of interest to region of interest conversion. In: Proceedings of the 21st ACM SIGSPATIAL International Conference on Advances in Geographic Information Systems (SIGSPATIAL GIS 2013), 05-08 Nov 2013, Orlando, FL, USA. pp. 388-391. ACM. ISBN 978-1-4503-2521-9
van Keulen, M. and de Graaff, V. and Zhu, Zhemin and de By, R.A. and Wombacher, A. and Flokstra, Jan (2013) //Rondje Zilverling: COMMIT/TimeTrails. I/O Vivat, 28 (4). pp. 16-17. ISSN 1389-0468


de Graaff, V. and van Keulen, M. and de By, R.A. (2012) Towards Geosocial Recommender Systems. In: 4th International Workshop on Web Intelligence & Communities (WI&C 2012), 16 Apr 2012, Lyon, France. 8:1-8:4. ACM. ISBN 978-1-4503-1189-2
de Graaff, V. and van Keulen, M. and de By, R.A. (2012) Semantic Enrichment of GPS Trajectories. In: Dutch-Belgian Database Day (DBDBD 2012), 21 Nov 2012, Brussels, Belgium. University of Brussels. ISBN not assigned