Class Capture-the-Flag Exercises. Mirkovic, J. & Peterson, P. A. 2014 USENIX Summit on Gaming, Games, and Gamification in Security Education (3GSE 14), USENIX Association, 2014.
bibtex   
@article{mirkovic2014class,
  title={Class Capture-the-Flag Exercises},
  author={Mirkovic, Jelena and Peterson, Peter AH},
  journal={2014 USENIX Summit on Gaming, Games, and Gamification in Security Education (3GSE 14)},
  year={2014},
  publisher={USENIX Association}
}

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