author        = "Aleman, I. and Ueta, T. and Ladjal, D. and Exter, K. and
                       Kastner, J. and Montez, R. and Tielens, X. and Chu, Y.-H.
                       and Izumiura, H. and McDonald, I. and Sahai, R. and
                       Siódmiak, N. and Szczerba, R. and van Hoof, P. A. M. and
                       Villaver, E. and Vlemmings, W. and Wittkowski, M. and
                       Zijlstra, A.",
      title         = "{Herschel Planetary Nebula Survey (HerPlaNS): First
                       Detection of OH+ in Planetary Nebulae}",
      year          = "2015",