@article{StaatBallmann2011,
  author    = {Manfred Staat and J. Ballmann},
  title     = {Computation of impacts on elastic solids by methods of bicharacteristics},
  journal   = {Computational Mechanics '88 : theory and applications ; proceedings of the International Conference on Computational Engineering Science April 10-14, 1988, Atlanta, GA, USA ; vol. 2},
  pages     = {1719 -- 1722},
  year      = {2011},
}