@inproceedings{UrbanRiedelSchmuntzschetal.2019,
  author    = {Tobias Urban and Ren{\´e} Riedel and Ulrike Schmuntzsch and Norbert Pohlmann and Matthias R{\"o}tting},
  title     = {Riddle me this! Context Sensitive CAPTCHAs”},
  booktitle = {Konferenz: EuroUSEC 2017 Workshop. The 2nd European Workshop on Usable Security. 29. April 2017 in Paris, Frankreich},
  url       = {https://norbert-pohlmann.com/wp-content/uploads/2018/01/367-Riddle-me-this-Context-Sensitive-CAPTCHAs-Prof.-Norbert-Pohlmann.pdf},
  year      = {2019},
}