To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:eiulhwlanwta, year=2012, title={{RegTAP} examples}, author={{GAVO} Data Centre}, url={https://dc.zah.uni-heidelberg.de/rr/q/ex/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }