This service has an associated publication. If you use its data, it may be appropriate to reference 2007A&A...464.1177M (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:DFBS_SSAP, year=2017, title={Digitized First Byurakan Survey ({DFBS}) Spectra Query Service}, author={Markarian, B.E.}, url={http://dc.zah.uni-heidelberg.de/dfbsspec/q/getssa/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }