R. Boardman, and M. Sasse. Proceedings of the SIGCHI conference on Human factors in computing
systems, CHI, volume 6 of CHI Letters, page 583 - 590. ACM Press, New York, (2004)
M. Musolesi, and C. Mascolo. Proceedings of the 2nd international workshop on Multi-hop ad hoc networks: from theory to reality, page 31--38. ACM, (2006)