@inproceedings{Visser:2009Wj,
  author = "Visser, Matt",
  title = "{Black holes in general relativity}",
  doi = "10.22323/1.075.0001",
  booktitle = "Proceedings of Black Holes in General Relativity and String Theory {\textemdash} PoS(BHs, GR and Strings)",
  year = 2009,
  volume = "075",
  pages = "001"
}