@inproceedings{DBLP:conf/usenix/Hartmeier02,
  author    = {Daniel Hartmeier},
  title     = {Design and Performance of the OpenBSD Stateful Packet Filter
               (pf)},
  booktitle = {USENIX Annual Technical Conference, FREENIX Track},
  year      = {2002},
  pages     = {171-180},
  ee        = {http://www.usenix.org/publications/library/proceedings/usenix02/tech/freenix/hartmeier.html},
  crossref  = {DBLP:conf/usenix/2002f},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/usenix/2002f,
  editor    = {Chris G. Demetriou},
  title     = {Proceedings of the FREENIX Track: 2002 USENIX Annual Technical
               Conference, June 10-15, 2002, Monterey, California, USA},
  booktitle = {USENIX Annual Technical Conference, FREENIX Track},
  publisher = {USENIX},
  year      = {2002},
  isbn      = {1-880446-01-4},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}