@TECHREPORT{WidmayerWW1985TR,
  author = {P. Widmayer and Y.F. Wu and C.K. Wong},
  title = {{O}n the {A}pproximation of {S}teiner {M}inimal {T}rees in {G}raphs.},
  institution = {Institut f\"{u}r Angewandte Informatik und Formale Beschreibungsverfahren,
	Universit\"{a}t Karlsruhe, Germany},
  year = {1985}
}

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