[Regressive types of students].

@article{Mueller1961RegressiveTO,
  title={[Regressive types of students].},
  author={Reinhold G. Mueller},
  journal={Psychologische Praxis; Schriftenreihe fur Erziehung und Jugendpflege},
  year={1961},
  volume={29},
  pages={155-9}
}