Jochen Könemann Stefano Leonardi Guido Schäfer Stefan H. M. van Zwam A Group-Strategyproof Cost Sharing Mechanism for the Steiner Forest Game. 1319-1341 2008 37 SIAM J. Comput. 5 http://dx.doi.org/10.1137/050646408 db/journals/siamcomp/siamcomp37.html#KonemannLSZ08