Reference:

Hao Wang, Somesh Jha, Thomas Reps, Stefan Schwoon, and Stuart Stubblebine. Reducing the dependence of SPKI/SDSI on PKI. In Dieter Gollmann, Jan Meier, and Andrei Sabelfeld, editors, Proceedings of the 11th European Symposium on Research in Computer Security (ESORICS), volume 4189 of Lecture Notes in Computer Science, pages 156–173, Hamburg, Germany, September 2006. Springer.

Suggested BibTeX entry:

@inproceedings{WJR06,
    address = {Hamburg, Germany},
    author = {Hao Wang and Somesh Jha and Thomas Reps and Stefan Schwoon and Stuart Stubblebine},
    booktitle = {Proceedings of the 11th European Symposium on Research in Computer Security (ESORICS)},
    editor = {Dieter Gollmann and Jan Meier and Andrei Sabelfeld},
    month = {September},
    pages = {156--173},
    publisher = {Springer},
    series = {Lecture Notes in Computer Science},
    title = {Reducing the Dependence of {SPKI/SDSI} on {PKI}},
    volume = {4189},
    year = {2006}
}