@misc{BoernertRinglebWilbert2018,
  author    = {Moritz B{\"o}rnert-Ringleb and J{\"u}rgen Wilbert},
  title     = {The Association of Strategy Use and Concrete-Operational Thinking in Primary School},
  booktitle = {Postprints der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  number    = {431},
  institution = {Humanwissenschaftliche Fakult{\"a}t},
  series    = {Zweitver{\"o}ffentlichungen der Universit{\"a}t Potsdam : Humanwissenschaftliche Reihe},
  number    = {431},
  type      = {postprint},
  pages     = {11},
  year        = {2018},
}