Proc. of INOC 2011, 5th International Conference on Network Optimization, LNCS 6701, pp. 51–56, Springer, 2011 Proc. of INOC 2011, 5th International Conference on Network Optimization, LNCS 6701, pp. 51–56, Springer, 2011, Jan 2011, Hamburg, Germany Lecture Notes in Computer Science ISBN: 9783642215261