@article{metropol-hyytia-orl-2010,
  author = {Esa Hyyti{\"a} and Samuli Aalto and Aleksi Penttinen and Reijo Sulonen},
  title = {A stochastic model for a vehicle in a dial-a-ride system},
  journal = {Operations Research Letters},
  publisher = {Elsevier},
  year = {2010},
  month = {May.},
  volume = {38},
  number = {5},
  url = {http://dx.doi.org/10.1016/j.orl.2010.05.009},
}