STCON in Directed Unique-Path Graphs.

Sampath Kannan Sanjeev Khanna Sudeepa Roy STCON in Directed Unique-Path Graphs. 2008 FSTTCS http://drops.dagstuhl.de/opus/volltexte/2008/1758 conf/fsttcs/2008 db/conf/fsttcs/fsttcs2008.html#KannanKR08