NASA NTRS · 19710045925
I Zw 1 - A variable compact galaxy
Abstract
Radio quiet compact galaxy I Zw 1 /0051 plus 12/ photometric data, noting variability and brightness levels
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Barrett, J. W., Shen, B. S. P., Usher, P. D.. 1971-05-01. I Zw 1 - A variable compact galaxy. https://ntrs.nasa.gov/citations/19710045925
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