To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:GloTS_tabcol, year=2010, title={{GloTS} columns for table}, author={{GAVO} Data Centre}, url={https://dc.zah.uni-heidelberg.de/glots/q/showcols/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }