@misc{11523,
  author = {Hans Langtangen and Are Bruaset},
  title = {The History and Philosophy of Diffpack},
  year = {2003},
  journal = {Invited minisymposium talk at the 21st CAD-FEM User{\textquoteright}s Meeting, Potsdam, Germany},
  month = {November},
  note = {Presented by H. P. Langtangen},
}