Réka Albert Bhaskar DasGupta Riccardo Dondi Eduardo D. Sontag Inferring (Biological) Signal Transduction Networks via Transitive Reductions of Directed Graphs. 129-159 2008 51 Algorithmica 2 http://dx.doi.org/10.1007/s00453-007-9055-0 db/journals/algorithmica/algorithmica51.html#AlbertDDS08