@techreport{83d892062fcd4ae2973af7a3851acdea,
title = "When two aspire to become one: city-twinning in Northern Europe",
keywords = "Urban planning, Urban development, Border integration, Boundaries, Europe",
author = "Pertti Joenniemi and Alexander Sergunin",
year = "2009",
language = "English",
isbn = "9788776053475",
series = "DIIS Working Paper",
publisher = "Danish Institute for International Studies",
number = "21",
address = "Denmark",
type = "WorkingPaper",
institution = "Danish Institute for International Studies",
}