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Variability of Emission Lines in the Planetary Nebulae IC 4997 and NGC 6572
Walter A. Feibelman, Lawrence H. Aller and Siek HyungVolume:
104
Journal:
Publications of the Astronomical Society of the Pacific
DOI:
10.2307/40679872
Date:
May, 1992
File:
PDF, 1.29 MB
1992