@inproceedings{Smith&Gibbons2007:Unifying,
  title = "Unifying Theories of Objects",
  author = "Michael Anthony Smith and Jeremy Gibbons",
  year = "2007",
  booktitle = "Integrated Formal Methods",
  editor = "Jim Davies and Jeremy Gibbons",
  pages = "599-618",
  publisher = "Springer-Verlag",
  series = "Lecture Notes in Computer Science",
  url = "http://www.comlab.ox.ac.uk/jeremy.gibbons/publications/uto.pdf",
  volume = "4591",
}