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References
- ↑ Schmeidler, Felix. Geschichte der Astronomischen Gesellschaft (in German). Astronomische Gesellschaft. pp. 45–46.
- ↑ Encyclopedia.com. "Heckmann, Otto Hermann Leopold". www.encyclopedia.com. Retrieved 2024-04-20.
- DavidDarling.info Archived 2017-06-29 at the Wayback Machine
- Astro.it
