@article {10431,
	title = {Hierarchical multimodal hub location problem with time-definite deliveries},
	journal = {Transportation Research Part E: Logistics and Transportation Review},
	volume = {48},
	year = {2012},
	pages = {1107-1120},
	url = {https://doi.org/10.1016/j.tre.2012.04.001},
	author = {Alumur, S.A. and Yaman, H. and Kara, B.Y.}
}