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1987 a+a 177-217-spectral-classes
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1987A&A...177..217D
1987A&A...177..217D
1987A&A...177..217D
1987A&A...177..217D
1987A&A...177..217D
1987A&A...177..217D
1987A&A...177..217D
1987A&A...177..217D
1987A&A...177..217D
1987A&A...177..217D
1987A&A...177..217D