Data-Driven Process Discovery and Analysis 8th IFIP WG 2.6 International Symposium, SIMPDA 2018, Seville, Spain, December 13–14, 2018, and 9th International Symposium, SIMPDA 2019, Bled, Slovenia, September 8, 2019, Revised Selected Papers Ceravolo Paolo Heftet / 2020 / Engelsk