This service has an associated publication. If you use its data, it may be appropriate to reference 2004ApJS..155..271S (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:CDFS_SSAP, year=2015, title={Optical Spectroscopy in the {CDFS}}, author={Szokoly, G. P.; Bergeron, J.; Hasinger, G.; Lehmann, I.; Kewley, L.; Mainieri, V.; Nonino, M.; Rosati, P.; Giacconi, R.; Gilli, R.; Gilmozzi, R.; Norman, C.; Romaniello, M.; Schreier, E.; Tozzi, P.; Wang, J. X.; Zheng, W.; Zirm, A.}, url={http://dc.zah.uni-heidelberg.de/cdfspect/q/ssa/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }