@inproceedings{STOC-1995-BorchersD,
	author        = "Al Borchers and Ding-Zhu Du",
	booktitle     = "{Proceedings of the 27th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/225058.225282",
	isbn          = "0-89791-718-9",
	pages         = "641--649",
	publisher     = "{ACM}",
	title         = "{The k-Steiner ratio in graphs}",
	year          = 1995,
}