@inproceedings{CFP13,
  author        = {X. Chen and D. Fonkwe and J. Pang},
  title         = {Post-hoc analysis of user traceability in electronic toll collection systems},
  booktitle     = {Proc.\ 7th Workshop on Data Privacy Management (DPM'12)},
  publisher     = {Springer-Verlag},
  series        = {Lecture Notes in Computer Science},
  year          = {2013},
  volume        = {7731},
  pages         = {29-42},
  url           = {http://satoss.uni.lu/jun/papers/DPM12.pdf}
}