1. Alonso W (1978) A theory of movements. In: Hansen NM (ed) Human settlement systems. Ballinger, Cambridge, MA, pp 197–211
2. Bröcker J (1984) How do international trade barriers affect interregional trade? In: Anderson AE, Isard W, Puu T (eds) Regional and industrial development. North-Holland, Amsterdam, pp 219–239
3. Bröcker J (1988) Interregional trade and economic integration. Reg Sci Urban Econ 18:261–281
4. Bröcker J, Rohweder HC (1989) Ein multilaterales Modell des Welthandels. Institut für Regional-forschung, Universität Kiel, Kiel
5. Choukroun J-M (1975) A general framework for the development of gravity-type trip distribution models. J Reg Sci Urban Econ 5:177–202