Signorini, Alessio, Segre, Alberto Maria, Polgreen, Philip M., The Use of Twitter to Track Levels of Disease Activity and Public Concern in the U.S. during the Influenza A H1N1 Pandemic, in: PLoS ONE 6 5 (2011), S. e19467.

Keally, Matthew, Zhou, Gang, Xing, Guoliang, Wu, Jianxin, Pyles, Andrew: PBN: towards practical activity recognition using smartphone-based body sensor networks. In: Proceedings of the 9th ACM Conference on Embedded Networked Sensor Systems. New York, NY, USA : ACM, 2011 (SenSys '11). - ISBN 978-1-4503-0718-5, S. 246--259