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==Milky Way SSXSs==
SSXSs have now been discovered in our galaxy and in globular cluster M3.<ref name=White/> MR Velorum (RX J0925.7-4758) is one of the rare MW supersoft X-ray binaries.<ref name=Greiner>{{ cite journal |doi=10.1016/S1384-1076(00)00018-X |author=Greiner J |title=Catalog of supersoft X-ray sources |journal= New Astronomy|date=2000 |volume=5 |issue=3 |pages=137–41 |url=http://www.mpe.mpg.de/~jcg/sss/ssscat.html |arxiv = astro-ph/0005238 |bibcode = 2000NewA....5..137G |s2cid=52241439 }}</ref> "The source is heavily reddened by interstellar material, making it difficult to observe in the blue and ultraviolet."<ref name=Schmidtke>{{ cite journal |doi=10.1086/322155 |author=Schmidtke PC |author2=Cowley AP|author2-link=Anne Cowley |title=Synoptic Observations of the Supersoft Binary MR Velorum (RX J0925.7-4758): Determination of the Orbital Period |journal= The Astronomical Journal|date=Sep 2001 |volume=122 |issue= 3|pages=1569–71 |url=http://www.iop.org/EJ/article/1538-3881/122/3/1569/201190.text.html |bibcode=2001AJ....122.1569S|doi-access=free |url-access=subscription }}</ref> The period determined for MR Velorum at ~4.03 d is considerably longer than that of other supersoft systems, which is usually less than a day.<ref name=Schmidtke/>
==Close-binary supersoft source (CBSS)==
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