@inproceedings{MacLaneDevelopment,
  author =       "Saunders MacLane",
  title =        "The Development of Mathematical Ideas by Collision: the Case of Categories and Topos Theory",
  year =         1989,
  title =        "Categorical Topology and its relation to Analysis,
                  Algebra and Combinatorics",
  pages =        "1--9",
  publisher =    "World Scientific Publishing"
}