Number of items:
1
.
Persson, Sven Eric
(1972)
Interpretation of the Neutral Helium Triplet Spectrum in Planetary Nebulae.
Dissertation (Ph.D.), California Institute of Technology.
doi:10.7907/FNVG-6W53.
https://resolver.caltech.edu/CaltechETD:etd-08212008-101113
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Wed Dec 17 12:16:04 2025 UTC
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