This service has an associated publication. If you use its data, it may be appropriate to reference 2010ASPC..424...75M (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:nmdb_web, year=2015, title={{NMDB}: Real-time Database for High Resolution Neutron Monitor Measurements}, author={Steigies, C. and Kudela, K. and Usoskin, I. and Flückiger, E.O. and Eroshenko, E. and Mavromichalaki, H. and Klein, K.-L. and Chilingaryan, A. and Kryakunova, O. and Dorman, L. and Medina, J.}, url={http://dc.zah.uni-heidelberg.de/gvo/data/nmdb/run/info}, howpublished={{VO} resource provided by the {GAVO} Data Center} }