@InProceedings{friggstad_et_al:LIPIcs.SWAT.2016.3,
  author =	{Friggstad, Zachary and K\"{o}nemann, Jochen and Shadravan, Mohammad},
  title =	{{A Logarithmic Integrality Gap Bound for Directed Steiner Tree in Quasi-bipartite Graphs}},
  booktitle =	{15th Scandinavian Symposium and Workshops on Algorithm Theory (SWAT 2016)},
  pages =	{3:1--3:11},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-011-8},
  ISSN =	{1868-8969},
  year =	{2016},
  volume =	{53},
  editor =	{Pagh, Rasmus},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SWAT.2016.3},
  URN =		{urn:nbn:de:0030-drops-60323},
  doi =		{10.4230/LIPIcs.SWAT.2016.3},
  annote =	{Keywords: Approximation algorithm, Primal-Dual algorithm, Directed Steiner tree}
}