@article{VockPenkKoeller2014,
  author    = {Miriam Vock and Christiane Penk and Olaf Koeller},
  title     = {Who skips a grade? Findings concerning grade acceleration in German schools},
  journal   = {Psychologie in Erziehung und Unterricht : Zeitschrift f{\"u}r Forschung und Praxis},
  volume    = {61},
  number    = {3},
  pages     = {153 -- 164},
  doi       = {10.2378/peu2013.art22d},
  year      = {2014},
}