Ingo Kofler Joachim Seidl Christian Timmerer Hermann Hellwagner Ismail Djama Toufik Ahmed Using MPEG-21 for cross-layer multimedia content adaptation. 355-370 2008 2 Signal, Image and Video Processing 4 http://dx.doi.org/10.1007/s11760-008-0088-x db/journals/sivp/sivp2.html#KoflerSTHDA08