@book{22063,
	author = {Promel, Hans Jurgen and Steger, Angelika and Steger, Angelika ; jt. auth.},
	title = {The Steiner tree problem; a tour through graphs, algorithms, and complexity},
	publisher = {Vieweg},
	year = {2002},
	series = {Advanced lectures in Mathematics},
	address = {Wiesbaden}
}