@InProceedings{HOH03,
  author =       {Erik Ernst},
  title =        {Higher-Order Hierarchies},
  booktitle =    {Proceedings {ECOOP} 2003},
  editor =       {Luca Cardelli},
  series =       {LNCS 2743},
  year =         2003,
  publisher =    {Springer-Verlag},
  address =      {Heidelberg, Germany},
  month =        jul,
  pages =        {303--329},
}