Tobias Harks Utility Proportional Fair Bandwidth Allocation: An Optimization Oriented Approach. 61-74 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3375&spage=61 2005 conf/qosip/2005 QoS-IP db/conf/qosip/qosip2005.html#Harks05