Cross-Border Projects in Digital Education Ecosystems. - Carsten Wolff; Galyna Tabunshchyk; Peter Arras; Jose Ramon Otegi-Olaso; Sergey Bushuyev; Olena Verenych; Anatoly Sachenko; Christian Reimann; Bassam A. Hussein; Elena Vitkauskaite; Ekaterina Mikhaylova; Areej Aldaghamin; et al. (ICL (1), 2021)