Flows on Few Paths: Algorithms and Lower Bounds.

Maren Martens Martin Skutella Flows on Few Paths: Algorithms and Lower Bounds. 520-531 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3221&spage=520 2004 conf/esa/2004 ESA db/conf/esa/esa2004.html#MartensS04