1. P. Allen, M. Sanglier, A dynamic model of growth in a central place system. Geogr. Anal. 2, 256–272 (1979)
2. B.J.L. Berry, Cities as systems within systems of cities 1964. Pap. Reg. Sci. 13(1), 147–163 (1964)
3. B.J.L. Berry, Urbanization and Counter-Urbanization, vol. 11 (Sage Publications, Incorporated, 1976)
4. L.M. Bettencourt, J. Lobo, D. Helbing, C. Kühnert, G.B. West, Growth, innovation, scaling, and the pace of life in cities. PNAS - Proc. Natl. Acad. Sci. 104(17), 7301–7306 (2007)
5. L. Bourne, Urban Systems: Strategies for Regulation. A Comparison of Policies in Britain, Sweden, Australia and Canada (Oxford University Press, London, 1975)