References
==========

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     `ADS <https://ui.adsabs.harvard.edu/abs/2013A%26A...549A..71K/abstract>`_

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* .. [Roth2005] Roth M. M., et al., 2005, PASP, 117, 620;
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* .. [Weilbacher2020] Weilbacher, P. M., et al., 2020, A&A, accepted;
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