@article{HelbigBaierKroth2012,
  author    = {Marcel Helbig and Tina Baier and Anna Kroth},
  title     = {The Effect of Tuition Fees on Enrollment in Higher Education in Germany. Evidence from a Natural Experiment},
  journal   = {ZEITSCHRIFT FUR SOZIOLOGIE},
  volume    = {41},
  number    = {3},
  pages     = {227 -- 246},
  year      = {2012},
}