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Mitteilungen aus dem Fraunhofer Institut Nr. 93.
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Mehltretter, J.P. On π-Components in zeeman-split lines of the umbra spectrum. Sol Phys 9, 387–390 (1969). https://doi.org/10.1007/BF02391660
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DOI: https://doi.org/10.1007/BF02391660