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Benefits and external benefits of transport : a spatial view
Blum, Ulrich, (1996)
Spatial modeling in transportation
Anderson, Simon P., (2007)
The influence of the German social pension insurance system on private savings and on spatial income distribution
Blum, Ulrich, (1985)
The regional incidence of the social pension insurance budget in the Federal Republic of Germany
Blum, Ulrich, (1987)
Alterung der Bevölkerung und Innovation
Blum, Ulrich, (1999)