- Il-Yeol Song, Oscar Romero 0001, Robert Wrembel, editors, Proceedings of the 21st International Workshop on Design, Optimization, Languages and Analytical Processing of Big Data, co-located with EDBT/ICDT Joint Conference, DOLAP@EDBT/ICDT 2019, Lisbon, Portugal, March 26, 2019. Volume 2324 of CEUR Workshop Proceedings, CEUR-WS.org, 2019.