The concept differs from that of Central and Eastern Europe which is based on criteria[4] whereby the states of Central and Eastern Europe belong to two different geographical regions of Europe.
^Palmer, Alan (1970)The Lands between: A History of East-Central Europe Since the Congress of Vienna, New York: Macmillan
^J. Kłoczowski (ed.), Central Europe Between East and West, Lublin 2005, ISBN83-85854-86-X