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- 2010 (in German), Bergisch Gladbach: Joh. Heider, pp. 232–235, ISBN 978-3-87314-444-6, ISSN 0722-7671 Media related to Marc Schuh at Wikimedia Commons Official...8 KB (603 words) - 02:08, 8 January 2024
- Kalender, 80, 2010. Bergisch-Gladbach: Heider. pp. 192–200. ISBN 978-3-87314-444-6. Finke, Peter (2014). Citizen Science. Das unterschätzte Wissen der...23 KB (2,854 words) - 19:54, 3 September 2023