Matthias R. Brust Adrian Andronache Steffen Rothkugel HyLearn: A Mobile Learning System for Hybrid Networks. 395-399 2008 PerCom http://doi.ieeecomputersociety.org/10.1109/PERCOM.2008.105 conf/percom/2008 db/conf/percom/percom2008.html#BrustAR08