Innovations for Community Services 19th International Conference, I4CS 2019, Wolfsburg, Germany, June 24-26, 2019, Proceedings - Lüke, Karl-Heinz; Lüke, Karl-Heinz; Eichler, Gerald; Eichler, Gerald; Erfurth, Christian; Erfurth, Christian; Fahrnberger, Günter; Fahrnberger, Günter (Springer International Publishing : Imprint: Springer, 2019)