@ARTICLE{vanKreveld2011,
  author = {van Kreveld, Marc and van Lankveld, Thijs and Veltkamp, Remco C.},
  title = {On the shape of a set of points and lines in the plane},
  journal = {Computer Graphics Forum},
  year = {2011},
  volume = {30},
  pages = {1553--1562},
  number = {5}
}

@TECHREPORT{vanKreveld2011a,
  author = {van Kreveld, Marc and van Lankveld, Thijs and Veltkamp, Remco C.},
  title = {On the shape of a set of points and lines in the plane},
  institution = {Utrecht University, Department of Information and Computing Sciences},
  year = {2011},
  number = {UU-CS-2011-017}
}