@book{ BA28155969,
  author    = "Dutton, Geoffrey and International Advanced Study Symposium on Topological Data Structures for Geographic Information Systems and Harvard University. Laboratory for Computer Graphics and Spatial Analysis",
  title     = "Harvard papers on geographic information systems : first international advanced study symposium on topological data structures for geographic information systems",
  publisher = "President and Fellows of Harvard College",
  year      = "1978",
  URL       = "http://ci.nii.ac.jp/ncid/BA28155969"
}