Author	M. Dopita D. Mason W. Robb
Year of Publication	1976
Date Published	Jan-07-1976
Journal Title	The Astrophysical Journal
Volume	207
Start Page or Article ID	102
ISSN Number	0004-637X
DOI	10.1086/154472
URL	http://articles.adsabs.harvard.edu/full/1976ApJ...207..102D
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	Journal Article
Publication Status	Published