To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:eiueilewpset, year=2007, title={{GAVO} Data Center}, author={{GAVO} Data Centre}, url={http://dc.zah.uni-heidelberg.de/__system__/services/root/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }