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Mallia, E.A., Blackwell, D.E. & Petford, A.D. Further study of H2O lines in the umbral spectrum in the region of 0.93μ. Sol Phys 20, 369–371 (1971). https://doi.org/10.1007/BF00159768
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DOI: https://doi.org/10.1007/BF00159768