B. Yang, T. Condie, S. Kamvar, und H. Garcia-Molina. Distributed Computing Systems, 2005. ICDCS 2005. Proceedings. 25th IEEE International Conference on, Seite 91--100. IEEE, (2005)
J. Beck, B. Woolf, und C. Beal. Proc. 17th Ntl. Conf. on Artificial Intelligence
and 12th Conf. on Innovative Applications of Artificial Intelligence, Seite 552--557. AAAI Press / The MIT Press, (2000)