@article{hwang_steiner_1992,
	title = {Steiner tree problems},
	volume = {22},
	issn = {1097-0037},
	url = {http://onlinelibrary.wiley.com/doi/10.1002/net.3230220105/abstract},
	doi = {10.1002/net.3230220105},
	language = {en},
	urldate = {2011-10-04TZ},
	journal = {Networks},
	author = {Hwang, F. K and Richards, D. S},
	year = {1992},
	pages = {55--89}
}

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