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Ahlfeldt, Gabriel M. and Wendland, Nicolai (2011) Fifty years of urban accessibility: the impact of the urban railway network on the land gradient in Berlin 1890-1936. Regional science and urban economics, 41 (2). pp. 77-88. ISSN 0166-0462
Ahlfeldt, Gabriel M. and Wendland, Nicolai (2013) How polycentric is a monocentric city?: centers, spillovers and hysteresis. Journal of economic geography, 13 (1). pp. 53-83. ISSN 1468-2702