author        = "Etxaluze, M. and Cernicharo, J. and Goicoechea, J. R. and
                       van Hoof, P. A. M. and Swinyard, B. M. and Barlow, M. J.
                       and van de Steene, G. C. and Groenewegen, M. A. T. and
                       Kerschbaum, F. and Lim, T. L. and Lique, F. and Matsuura,
                       M. and Pearson, C. and Polehampton, E. T. and Royer, P. and
                       Ueta, T.",
      title         = "{Herschel spectral mapping of the Helix nebula (NGC 7293).
                       Extended CO photodissociation and OH+ emission}",
      year          = "2014",