To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:GAVO_DC_SIA2, year=2016, title={{GAVO} Data Center {SIAP} Version 2 Service}, author={{GAVO} Data Centre}, url={http://dc.zah.uni-heidelberg.de/__system__/siap2/sitewide/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }