U. Schulze, T. Heck, M. Rittberger, and D. Kanwischer, “Geography Teacher Training in Transition: Subject-Specific Concepts and Open Educational Practices in the Context of the Frankfurt Triangle for Education in the Digitally Networked World: Fachkonzepte und offene Bildungspraktiken im Kontext des Frankfurt-Dreiecks zu Bildung in der digital vernetzten Welt”, OpenSpaces, pp. 6–23, Jul. 2025.