To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:stcs_to_utype, year=2010, title={{STC} utype generator}, author={{GAVO} Data Centre}, url={http://dc.zah.uni-heidelberg.de/stctrans/q/utypes/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }