This service has an associated publication. If you use its data, it may be appropriate to reference 2017ApJ...844..155T (ADS BibTeX entry for the publication) either in addition to or instead of the service reference.
To cite the service as such, we suggest the following BibTeX entry:
@MISC{vo:eisdowgiuuwg, year=2020, title={{PPAKM31} cube datalink service}, author={Kreckel, K. and Tomičić, N. and Sandstrom, K. and Groves, B.}, url={https://dc.zah.uni-heidelberg.de/ppakm31/q/cdl/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }