Réka Albert Bhaskar DasGupta Riccardo Dondi Eduardo D. Sontag Inferring (Biological) Signal Transduction Networks via Transitive Reductions of Directed Graphs Electronic Colloquium on Computational Complexity (ECCC) 2006 010 db/journals/eccc/eccc13.html#TR06-010 http://eccc.hpi-web.de/eccc-reports/2006/TR06-010/index.html