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Past. Springer. pp. 360–372. doi:10.1007/978-1-4613-8090-0_34. ISBN 978-1-4613-8092-4. Retrieved 21 December 2021. UNI Leipzig Professorenkatalog (biographical...

The Past (PDF). New York, USA: Springer New York. pp. 462–473. ISBN 978-1-4613-8092-4. Viebahn, Christoph (2001). "Hensen's node". Genesis. 29 (2): 96–103...

Springer New York. pp. 551–561. doi:10.1007/978-1-4613-8090-0_50. ISBN 978-1-4613-8092-4., Quote: "According to Surya Siddhanta the earth is a sphere." Plofker...