To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:gavoadql, year=2008, title={{AIP} {DaCHS} {ADQL} Query}, author={The {GAVO} data center team}, url={http://gavo.aip.de/__system__/adql/query/info}, howpublished={{VO} resource provided by the {AIP} {DaCHS}} }