@article{11163,
  author = {Kristian Holm{\r a}s and Hans Langtangen},
  title = {A Sharp Interface Finite Element Method for Elliptic Interface Problems; Formulation and Investigation in One Space Dimension},
  year = {2007},
  journal = {International Journal of Pure and Applied Mathematics},
  volume = {34},
  number = {3},
  pages = {287-312},
}