@article {bilge1997agv,
	title = {AGV systems with multi-load carriers: basic issues and potential benefits},
	journal = {Journal of manufacturing systems},
	volume = {16},
	number = {3},
	year = {1997},
	pages = {159{\textendash}174},
	publisher = {Elsevier},
	author = {{\"U}mit Bilge and Tanchoco, JMA}
}
