@article{Luebbecke2019a,
	author = {M. L\"{u}bbecke},
	title = {Combinatorially Simple Pickup and Delivery Paths},
	journal = {Central European Journal of Operations Research},
	year = {2004},
	number = {4},
	pages = {405--417},
	volume = {12},
	month = {Sep}
}