@article{PenaStastinskaEstebanetal.1998,
  author    = {M. Pena and G. Stastinska and C. Esteban and Lars Koesterke and S. Medina and R. Kingsburgh},
  title     = {Galactic planetary nebulae with Wolf-Rayet nuclei : I. Objects with [WC]-early type stars},
  year      = {1998},
}