@article{VandeSteene:2775,
      author        = "Van de Steene, G. C. and  Exter, K. M. and  van Hoof, P.
                       A. M. and  Lim, T. L. and  Barlow, M. J. and  Matsuura, M.
                       and  Ueta, T.",
      title         = "{A Herschel study of Planetary Nebulae}",
      year          = "2012",
}