@article{ainsworth2000approximation,
  title = "Approximation theory for the hp-version finite element method and application to the non-linear Laplacian",
  author = "Ainsworth, Mark and Kay, David",
  year = "2000",
  journal = "Applied numerical mathematics",
  number = "4",
  pages = "329--344",
  publisher = "North-Holland",
  volume = "34",
}