@article{PovalačovaLeffersScheepens2013,
  author    = {Diana Povalačov{\´a} and Marjon Leffers and Evelien Scheepens},
  title     = {Developing lessons},
  journal   = {Potsdamer geographische Praxis},
  number    = {3},
  pages     = {117 -- 121},
  year      = {2013},
}