The Digitized First Byurakan Survey (DFBS) is the digitized version of the famous Markarian survey, called also the First Byurakan Survey (FBS).
It is the largest spectroscopic database in the world, providing low-dispersion spectra for 20,000,000 objects.
DFBS is a joint project of the Byurakan Astrophysical Observatory (BAO, Armenia), Cornell University (USA), Universita di Roma "La Sapienza" (Italy) and VO Paris (France).
The whole Northern sky and part of the Southern sky at high galactic latitudes have been observed in FBS, altogether more than 17,000 deg2. It is especially valuable for extragalactic research.
1500 UV-excess galaxies (Markarian galaxies), 1100 blue stellar objects and 900 late-type stars have been discovered on the basis of FBS, as well as 1600 infrared (IRAS) sources have been optically identified.
There are two main webpages for DFBS:

DFBS is the basis of the Armenian Virtual Observatory (ArVO). A collaboration between VO France and ArVO is going on for making VO access to the DFBS plates and the low-dispersion spectra.

SIA on DFBS: SIA Access to DFBS images (ALADIN, etc.): Observatoire de Paris, CDS

SSA on DFBS: SSA Access to DFBS low-dispersion spectra (VOSpec): CRAL

EXATODS:

• Extraction and analysis of DFBS spectra: IPSL, SA
• Search and studies of Asteroids in the DFBS plates: IMCCE

AGN: Search and studies of new bright AGN in DFBS: CRAL

Uniroma1:

• Search for Blue Stellar Objects in DFBS: BAO, Uniroma1
• Search for Extremely Red Objects in DFBS: BAO, Uniroma1
• Variability studies based on DFBS: BAO, Uniroma1

Berthier J., Thuillot W., Mickaelian A., Sarkissian A., et al. - Asteroid Search with the DFBS // Science with Virtual Observatories: JENAM-2007, Special Session #8, Yerevan 2007, in press.

Mickaelian A., Sarkissian A., Dubernet M.-L., Le Sidaner P., Prugniel P., Nesci R., et al. - Simple Spectral Access VO Application on the Digitized First Byurakan Survey // Science with Virtual Observatories: JENAM-2007, Special Session #8, Yerevan 2007, in press.

Thuillot W., Berthier J., Sarkissian A., Mickaelian A., Sargsyan L., Iglesias J., Vachier F., Birlan M., Simon, G. - Massive Physical and Dynamical Characterization of Asteroids // The Virtual Observatory in Action: New Science, New Technology, and Next Generation Facilities, 26th meeting of the IAU, Special Session 3, 17-18, 21-22 August, 2006 in Prague, Czech Republic, SPS3, 2007, in press.

Gavrilovic N., Mickaelian A.M., Petit C., Popovic L.C., Prugniel P. - Activity type of galaxies in HyperLeda // Black Holes from Stars to Galaxies - Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #238, held 21-25 August, 2006 in Prague, Czech Republic. Cambridge, UK: Cambridge University Press, p. 371-372, April 2007.

Mickaelian A.M., Nesci R., Rossi C., Weedman D., Cirimele G., Sargsyan L.A., Erastova L.K., Gigoyan K.S., Mikayelyan G.A., Massaro E., Gaudenzi S., Houck J., Barry D., D'Amante L., Germano P. - The Digitized First Byurakan Survey - DFBS // Astron. Astrophysics, Vol 464, No. 3, p. 1177-1180, Mar IV 2007.

Mickaelian A.M., Gigoyan K.S., Nesci, R., Rossi C. - The Digitized First Byurakan Survey (DFBS): a Unique Database for Proper Motion, Variability Studies, and Object Classification // Proc. IAU GA XXVI, JD13: Exploiting large surveys for Galactic astronomy, held in Prague, August 22-23, 2006, Editors: C. Corbally, C. Bailer-Jones, S. Giridhar and T. Lloyd Evans, Memorie della Società Astronomica Italiana, Vol. 77, No. 4, p. 1159, Dec 2006.

Mickaelian A.M., Sargsyan L.A., Mikayelyan G.A., Erastova L.K., Sinamian P.K. - The Digitized First Byurakan Survey and the Armenian Virtual Observatory // Proceedings of the International Workshop on "Virtual Observatory: Plate Content Digitization, Archive Mining, and Image Sequence Processing", held in Sofia, Bulgaria, April 27-30, 2005, Eds. M.Tsvetkov, V.Golev, F.Murtagh, and R.Molina, Heron Press Science Series, p. 82-92, May 2006.

Mickaelian A.M., Hagen H.-J., Sargsyan L.A., Mikayelyan G.A. - Digitized First Byurakan Survey plate database // Catalog No. VI/116 at CDS, Strasbourg, 2 Aug 2005.

Nesci R., Rossi C., Sclavi S., Gaudenzi S., Mickaelian A.M., Sargsyan L.A., Erastova L.K. - Digitizing the Markarian Survey: First tests of scientific importance // Proc. JENAM-2003, Minisymp. "Synergies in Wide Field Observations", held August 2003, Budapest, Hungary; Baltic Astronomy, Vol. 13, No. 4, p. 671-676, Oct 2004.