... 2017-02-18¹ http://gsaweb.ast.cam.ac.uk/alerts/alert/Gaia16avr/

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... Catalogue² https://sne.space/sne/SN2016ehw/

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... IRAF³ IRAF is distributed by the National Optical Astronomy Observatory, which is operated by AURA under cooperative agreement with the National Science Foundation.

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... database⁴ https://ned.ipac.caltech.edu/

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