@article{KellerPreckelBrunner2021,
  author    = {Lena Keller and Franzis Preckel and Martin Brunner},
  title     = {Nonlinear relations between achievement and academic self-concepts in elementary and secondary school},
  journal   = {Journal of educational psychology / American Psychological Association},
  series    = {an integrative data analysis across 13 countries},
  volume    = {113},
  number    = {3},
  pages     = {585 -- 604},
  doi       = {10.1037/edu0000533},
  year      = {2021},
}