[37] Chen X, Yuan H. Construction and thinking of characteristic towns in southern Shaanxi based on big data analysis[D]. Revista de la Facultad de Ingeniería, 32, 869-876(2017).
[41] Brennan C, Hoene C, Hackler D. Demographic change in small cities, 1990 to 2000[D]. Urban Affairs Review, 40, 342-361(2005).
[42] Bell D, Jayne M. Small cities? Towards a research agenda[D]. International Journal of Urban and Regional Research, 33, 683-699(2009).
[49] Sridharan S, Tunstall H, Lawder R et al. An exploratory spatial data analysis approach to understanding the relationship between deprivation and mortality in Scotland[D]. Social Science &Medicine, 65, 1942-1952(2007).
[51] Cliff A, Ord K. Testing for spatial autocorrelation among regression residuals[D]. Geographical Analysis, 4, 267-284(1972).
[55] Fan J, Zhang Y. A preliminary analysis of land resources constraints on urban expansion of Beijing based on land supply and demand[D]. Journal of Resources and Ecology, 3, 253-261(2012).