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"variable star" » "variable step"
"variable stars" » "variable steps", "variable start"

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by Wrubel, Marshal H., Arp, H. C., Burbidge, G. R., Burbidge, E. Margaret
Published 1958
Springer Berlin Heidelberg
Table of Contents: ... Elemente in den Planeten und Meteoriten -- The Abundances of the Elements in the Sun and Stars -- Variable...