@article{Johnstone:2207,
      author        = "Johnstone, R. M. and  Canning, R. E. A. and  Fabian, A. C.
                       and  Ferland, G. J. and  Lykins, M. and  Porter, R. L. and 
                       van Hoof, P. A. M. and  Williams, R. J. R.",
      title         = "{Hydrogen two-photon continuum emission from the Horseshoe
                       filament in NGC 1275}",
      year          = "2012",
}