Kyoko Yamori Yoshiaki Tanaka Haruo Akimaru Price Optimization of Contents Delivery Systems with Priority. 65-74 2001 conf/icn/2001-1 ICN (1) http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2093&spage=0065 db/conf/icn/icn2001-1.html#YamoriTA01