Graham Attwell John Cook Andrew Ravenscroft Appropriating Technologies for Contextual Knowledge: Mobile Personal Learning Environments. 15-25 2009 WSKS (2) http://dx.doi.org/10.1007/978-3-642-04757-2_2 conf/wsks/2009-2 db/conf/wsks/wsks2009-2.html#AttwellCR09