@article{Vilhelmsen_2017,
title={Tramp ship routing and scheduling with voyage separation requirements},
volume={39},
ISSN={1436-6304},
url={http://dx.doi.org/10.1007/s00291-017-0480-4},
DOI={10.1007/s00291-017-0480-4},
number={4},
journal={OR Spectrum},
publisher={Springer Science and Business Media LLC},
author={Vilhelmsen,
Charlotte and Lusby,
Richard M. and Larsen,
Jesper},
year={2017},
month=may,
pages={913–943} }