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Ertel, H.: Gerl. Beitr. Geophys.67, H. 2 (1958).
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Ertel, H. Generalisierte Approximation der Fakultät. Naturwissenschaften 45, 53–54 (1958). https://doi.org/10.1007/BF00638603
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DOI: https://doi.org/10.1007/BF00638603