Public Domain
Werke:
- Individual Corrections to FK 3 and the declination system of the fourth fundamental catalogue (FK 4)
- Grundzüge der Einsteinschen Relativitätstheorie
- Grundzüge der Einsteinschen Relativitätstheorie
- Fourth fundamental Catalogue (FK 4) : Resulting from the revision of the Third fundamental Catalogue (FK 3)