Some Observations on the Computational Complexity of Graph Accessibility Problem.

Jun Tarui Seinosuke Toda Some Observations on the Computational Complexity of Graph Accessibility Problem. 18-30 http://link.springer.de/link/service/series/0558/bibs/1627/16270018.htm 1999 COCOON db/conf/cocoon/cocoon99.html#TaruiT99