Mqhele Nzama Alexander Ng Arkady B. Zaslavsky Adaptive Delivery of Multimedia Data in Heterogeneous and Mobile Environments. 41-52 http://link.springer.de/link/service/series/0558/bibs/1987/19870041.htm 2001 conf/mdm/2001 Mobile Data Management db/conf/mdm/mdm2001.html#NzamaNZ01