@inproceedings{heunenlandsmanspitters:tovariance,
  title = "The principle of general tovariance",
  author = "Chris Heunen, Nicolaas P. Landsman and Bas Spitters",
  year = "2008",
  journal = "International Fall Workshop on Geometry and Physics XVI, AIP Conference Proceedings",
  pages = "93-102",
  volume = "1023",
  doi = "10.1063/1.2958182",
}