@book{ BA03712340,
  author    = "Ehrenberg, A. S. C.",
  title     = "Data reduction : analysing and interpreting statistical data",
  publisher = "Wiley",
  year      = "1975",
  series    = "A Wiley-Interscience publication",
  number    = "",
  URL       = "https://ci.nii.ac.jp/ncid/BA03712340"
}