D. Carral, M. Krötzsch, M. Marx, A. Ozaki, and S. Rudolph. 21st International Conference on Database Theory (ICDT 2018), volume 98 of Leibniz International Proceedings in Informatics (LIPIcs), page 12:1--12:19. Dagstuhl, Germany, Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik, (2018)
DOI: 10.4230/LIPIcs.ICDT.2018.12