Jon Conrad Carla P. Gomes Willem Jan van Hoeve Ashish Sabharwal Jordan Suter Connections in Networks: Hardness of Feasibility Versus Optimality. 16-28 2007 conf/cpaior/2007 CPAIOR http://dx.doi.org/10.1007/978-3-540-72397-4_2 db/conf/cpaior/cpaior2007.html#ConradGHSS07