@inbook{8889,
  author = {B. Heimsund and T. Chan and Trygve Nilssen and Xue-Cheng Tai},
  title = {Level Set Methods for a Parameter Identification Problem},
  year = {2003},
  journal = {Analysis and optimization of differential systems},
  pages = {189-200},
  publisher = {Kluwer Academic Publishers},
  editor = {V. Barbu and I. Lasiecka and D. Tiba and C. Varsan},
}