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[3]
FRIESER H, 1955, MITTEILUNGEN FORSCHU
[4]
KAISER H, 1948, SPECTROCHIM ACTA, V3, P40
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KAISER H, 1948, SPECTROCHIM ACTA, V3, P297
[7]
Note on the photography of very faint spectra
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ASTROPHYSICAL JOURNAL,
1908, 27 (05)
:379-381