Bibliography of the density of the customer population of a service centre is high near the service centre but decrease with increasing distance due to the frictional effects of the distance
1. Arbia, Giuseppe and Antonio G. Paggio (2012). Spatial Econometrics: Statistical Foundations and Applications to Regional Convergence. Berlin: Springer.
2. Anas, Alex, Richard Arnott, and Kenneth Small (1998). Urban Spatial Structure. Journal of Economic Literature Vol. 36, No. 3:1426-1464.
3. Brakman, Steven and Harry Garretsen (2010). Agglomeration, Globalization, and Regional Growth Dynamics. Berlin: Springer.
4. Fujita, Masahisa and Paul R. Krugman (1995). The Spatial Economy: Cities, Regions, and International Trade. Cambridge: MIT Press.
5. Quigley, John M. (2014). Urban Economics and Public Policy: Homeownership in the Modern Era. Edward Elgar Publishing.