@article{KoenigSpodenFrey2020,
  author    = {Christoph K{\"o}nig and Christian Spoden and Andreas Frey},
  title     = {An optimized Bayesian hierarchical two-parameter logistic model for small-sample item calibration},
  journal   = {Applied psychological measurement},
  volume    = {44},
  number    = {4},
  pages     = {311 -- 326},
  doi       = {10.1177/0146621619893786},
  year      = {2020},
}