T. Kurashima, T. Iwata, G. Irie, and K. Fujimura. International Conference on Information and Knowledge Management (CIKM)
, page 579--588. New York, NY, USA, ACM, (2010)
B. Henne, M. Koch, and M. Smith. 18th International Conference on Financial Cryptography and Data Security (FC 2014)
, volume 8437 of LNCS, Springer, (2014)