@inproceedings{amaya2015,
  title={{Combining NLP and MILP in Vertical Flight Planning}},
  author={Amaya~Moreno, Liana and Yuan, Zhi and F{\"u}genschuh, Armin and Kaier, Anton and Schlobach, Swen},
  booktitle    = {Operations Research Proceedings},
  pages        = {273--278},
  publisher    = {Springer},
  year         = {2015}
}