@InProceedings{berman_et_al:LIPIcs.FSTTCS.2010.424,
  author =	{Berman, Piotr and Raskhodnikova, Sofya and Ruan, Ge},
  title =	{{Finding Sparser Directed Spanners}},
  booktitle =	{IARCS Annual Conference on Foundations of Software Technology and Theoretical Computer Science (FSTTCS 2010)},
  pages =	{424--435},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-939897-23-1},
  ISSN =	{1868-8969},
  year =	{2010},
  volume =	{8},
  editor =	{Lodaya, Kamal and Mahajan, Meena},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.FSTTCS.2010.424},
  URN =		{urn:nbn:de:0030-drops-28830},
  doi =		{10.4230/LIPIcs.FSTTCS.2010.424},
  annote =	{Keywords: Approximation algorithms, directed graphs, spanners}
}