This service has an associated publication. If you use its data, it may be appropriate to reference 2010AJ....139.2440R (ADS BibTeX entry for the publication) either in addition to or instead of the service reference.
To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:GAVO_PPMXL, year=2009, title={The {PPMXL} Catalog}, author={Röser, S. and Demleitner, M. and Schilbach, E. and Vickers, J. J.}, url={http://dc.zah.uni-heidelberg.de/ppmxl/q/cone/info}, howpublished={{VO} resource provided by the {GAVO} Data Center}, doi = {10.21938/puTViqDkMGcQZu8LSDZ5Sg} }
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To the extent possible under law, the publisher has waived all copyright and related or neighboring rights to PPMXL. For details, see the Creative Commons CC0 1.0 Public Domain dedication. Of course, you should still give proper credit when using this data as required by good scientific practice.
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