To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:gavoadql, year=2008, title={{ADQL} Query}, author={Planetary Sciences Group, {UPV}/{EHU}}, url={http://pvol2.ehu.eus:8083/__system__/adql/query/info}, howpublished={{VO} resource provided by the {PVOL} {EPN}-{TAP}} }