author        = "Oblak, E. and  Argue, A. N. and  Brosche, P. and  Cuypers,
                       J. and  Dommanget, J. and  Duquennoy, A. and  Froeschle, M.
                       and  Grenon, M. and  Halbwachs, J. L. and  Jasniewicz, C.
                       and  Lampens, P. and  Martin, F. and  Mermilliod, J. C. and
                        Mignard, F. and  Sinachopoulos, D. and  Seggewiss, W. and 
                       van Dessel, E.",
      title         = "{Photometry of Close Visual Binaries}",
      year          = "1993",