1. Abrahamsson C, Gren M (eds) (2012) GO: on the geographies of Gunnar Olsson. Burlington, Ashgate, Farnham
2. Agnew J (1994) The territorial trap: the geographical assumptions of international relations theory. Rev Int Polit Econ 1(1):53–80
3. Agnew J (2010) Still trapped in territory? Geopolitics 15(4):779–784
4. Ancel J (1938) Géographie des frontières. Gallimard, Paris
5. Andersen DJ, Klatt M, Sandberg M (eds) (2012) The border multiple: the practicing of borders between public policy and everyday life in a re-scaling Europe. Ashgate, Farnham