@article{RyglSeegerStrehmann2012,
  author    = {Pavel R{\´y}gl and Anett Seeger and Anja Strehmann},
  title     = {Developing lessons on the basis of the assignments},
  journal   = {Potsdamer geographische Praxis},
  number    = {1},
  pages     = {53 -- 58},
  year      = {2012},
}