Alexander Hall Katharina Langkau Martin Skutella An FPTAS for Quickest Multicommodity Flows with Inflow-Dependent Transit Times. 71-82 http://dx.doi.org/10.1007/978-3-540-45198-3_7 2003 conf/random/2003 RANDOM-APPROX db/conf/random/random2003.html#HallLS03