@inproceedings{FriedrichPuhlmannDS2004,
  crossref  = {Dagstuhl2004},
  author    = {Friedrich, Steffen and Puhlmann, Hermann},
  editor    = {Johannes Magenheim and Sigrid Schubert},
  title     = {{Exploring Test Items in the PISA-style for
              Informatics}},
  booktitle = {{Informatics and Student Assessment. Concepts of
              Empirical Research and Standardisation of Measurement
              in the Area of Didactics of Informatics}},
  year      = 2004,
  note      = {only abstract is available -- no paper},
}

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