Machine learning and knowledge discovery in databases European Conference, ECML PKDD 2019, Würzburg, Germany, September 16-20, 2019 : proceedings, part I - Brefeld, Ulf 1973-; Fromont, Elisa 1980-; Hotho, Andreas 1973-; Knobbe, Arno; Maathuis, Marloes H. 1978-; Robardet, Céline (Springer, 2020)