- Óscar Mealha, Mihai Dascalu, Tania Di Mascio, editors, Ludic, Co-design and Tools Supporting Smart Learning Ecosystems and Smart Education - Proceedings of the 6th International Conference on Smart Learning Ecosystems and Regional Development, SLERD 2021, Bucharest, Romania, June 2021. Volume 249 of Smart Innovation, Systems and Technologies, Springer, 2022.