@article{GrevingRichter2018,
  author    = {Sven Greving and Tobias Richter},
  title     = {Examining the testing effect in university teaching: retrievability and question format matter},
  journal   = {Frontiers in Psychology},
  volume    = {9},
  doi       = {10.3389/fpsyg.2018.02412},
  year      = {2018},
}