@inproceedings{PavlovicD:interpolation,
  author = "Dusko Pavlovic",
  booktitle = "Category Theory, Proceedings, Como 1990",
  editor = "A.~Carboni et al.",
  pages = "306--326",
  publisher = "Springer Verlag",
  series = "Lecture Notes in Mathematics",
  title = "Categorical interpolation: descent and the Beck-Chevalley condition without direct images",
  volume = "1488",
  year = "1991",
}