@book{ BA34449002,
 author = "Echenique, Marcial and Centre for Environmental Studies (Great Britain)",
 title = "Urban systems : towards an explorative model",
 publisher = "Centre for Environmental Studies",
 year = "1969",
 series = "University working papers",
 number = "CES UWP 2",
 URL = "https://ci.nii.ac.jp/ncid/BA34449002"
}
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