@article{UngerEckardtKoenke2007,
  author    = {J{\"o}rg F. Unger and Stefan Eckardt and Carsten K{\"o}nke},
  title     = {Modelling of cohesive crack growth in concrete structures with the extended finite element method},
  journal   = {Computer Methods in Applied Mechanics and Engineering},
  pages     = {4087 -- 4100},
  year      = {2007},
}