@article{BirnerBoenisch2011,
  author    = {Thomas Birner and Harald B{\"o}nisch},
  title     = {Residual circulation trajectories and transit times into the extratropical lowermost stratosphere},
  journal   = {Atmospheric chemistry and physics},
  volume    = {11},
  pages     = {817 -- 827},
  doi       = {doi:10.5194/acp-11-817-2011},
  url       = {http://www.atmos-chem-phys.net/11/817/2011/},
  year      = {2011},
}