@article{RetelsdorfBeckerKoelleretal.2012,
  author    = {Jan Retelsdorf and Michael Becker and Olaf K{\"o}ller and Jens M{\"o}ller},
  title     = {Reading development in a tracked school system: A longitudinal study over 3 years using propensity score matching},
  journal   = {British journal of educational psychology},
  volume    = {82},
  number    = {4},
  pages     = {647 -- 671},
  doi       = {10.1111/j.2044-8279.2011.02051.x},
  year      = {2012},
}