@InProceedings{schwan2015hybrid,
author="Schwan, Christian
and Strehler, Martin",
editor="Bock, Hans Georg
and Phu, Hoang Xuan 
and Rannacher, Rolf
and Schl{\"o}der, Johannes P.",
title="Two FPTAS for the Constrained Shortest Path Problem Applied to Hybrid Vehicle Routing",
booktitle="Modeling, Simulation and Optimization of Complex Processes  HPSC 2015 ",
year="2017",
publisher="Springer International Publishing",
address="Cham",
pages="223--234",
doi="10.1007/978-3-319-67168-0_18"
}