Torsten Tholey A Dynamic Data Structure for Maintaining Disjoint Paths Information in Digraphs. 565-574 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2906&spage=565 2003 conf/isaac/2003 ISAAC db/conf/isaac/isaac2003.html#Tholey03