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. and Bergeron, J. and Hasinger, G. and Lehmann, I. and Kewley, L. and Mainieri, V. and Nonino, M. and Rosati, P. and Giacconi, R. and Gilli, R. and Gilmozzi, R. and Norman, C. and Romaniello, M. and Schreier, E. and Tozzi, P. and Wang, J. X. and Zheng, W. and Zirm, A.}, url={http://dc.zah.uni-heidelberg.de/cdfspect/q/ssa/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }