The term was defined in a "scoping document" in Rotterdam in late 2004 and is being elaborated further using empirical data from the ESPON programme in a document entitled "The Territorial State and Perspectives of the European Union".
Thuật ngữ này đã được định nghĩa trong một "scoping document" tại Rốt-téc-đam vào cuối năm 2004 and is being elaborated further using empirical data from the ESPON programme in a document entitled The Territorial State and Perspectives of Liên minh châu Âu.