S. Vahdati, G. Palma, R. Nath, C. Lange, S. Auer, and M. Vidal. Digital Libraries for Open Knowledge, 22nd International Conference on Theory and Practice of Digital Libraries, TPDL 2018, Porto, Portugal, September 10-13, 2018, Proceedings, abs/1807.06816, page 103--115. (2018)