Transactions on large-scale data- and knowledge-centered systems XLV special issue on data management and knowledge extraction in digital ecosystems - Hameurlain, Abdelkader 1952-; Tjoa, A Min 1952-; Chbeir, Richard 1973-; Manolopoulos, Yannis 1957-; Ishikawa, Hiroshi 1956-; Ilarri, Sergio; Papadopoulos, Apostolos (Springer, 2020)