To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:WIRR, year=2014, title={{WIRR} VO Registry}, author={Demleitner, M. and Rothmaier, F.}, url={https://dc.zah.uni-heidelberg.de/wirr/q/ui/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }