New Trends in Database and Information Systems ADBIS 2021 Short Papers, Doctoral Consortium and Workshops: DOING, SIMPDA, MADEISD, MegaData, CAoNS, Tartu, Estonia, August 24-26, 2021, Proceedings - Bellatreche, Ladjel; Dumas, Marlon; Karras, Panagiotis; Matulevičius, Raimundas; Awad, Ahmed; Weidlich, Matthias; Ivanović, Mirjana; Hartig, Olaf (Springer International Publishing, 2021)