@book{ BA37290455,
  author    = "Greve, John",
  title     = "Voluntary housing in Scandinavia : a study of Denmark, Norway and Sweden",
  publisher = "Centre for Urban and Regional Studies University of Birmingham",
  year      = "1971",
  series    = "Occasional papers",
  number    = "no. 21",
  URL       = "http://ci.nii.ac.jp/ncid/BA37290455"
}