Database and expert systems applications 29th International Conference, DEXA 2018, Regensburg, Germany, September 3-6, 2018 : proceedings, part I - Hartmann, Sven 1969-; Ma, Hui; Hameurlain, Abdelkader 1952-; Pernul, Günther 1961-; Wagner, Roland 1952-2020 (Springer, 2018)