@INPROCEEDINGS{vanKreveld2012,
  author = {van Kreveld, Marc and van Lankveld, Thijs and de Rie, Maarten},
  title = {($\alpha,\delta$)-sleeves for reconstruction of rectilinear building
	facets},
  booktitle = {Proceedings of the 7th International 3D GeoInfo Conference},
  year = {2013},
  series = {Lecture Notes in Geoinformation and Cartography},
  pages = {231--248},
  publisher = {Springer Berlin Heidelberg}
}