B. Henne, and M. Smith. Proceedings of the 2013 International Conference on Financial Cryptography and Data Security (FC13), Workshop on Usable Security, 7862, page 131--148. Springer, (2013)
M. Smith, B. Henne, C. Szongott, and G. von Voigt. Digital Ecosystems Technologies (DEST), 2012 6th IEEE International Conference on, page 1 - 6. (June 2012)