@article{Ferland:1985,
      author        = "Ferland, G. J. and  Fabian, A. C. and  Hatch, N. A. and 
                       Johnstone, R. M. and  Porter, R. L. and  van Hoof, P. A. M.
                       and  Williams, R. J. R.",
      title         = "{The origin of molecular hydrogen emission in cooling-flow
                       filaments}",
      year          = "2008",
}