title: Structural shifts in urban population density gradients: an empirical investigation.
authors.forename: J B
authors.initials: JB
authors.lastname: Kau
authors.forename: C F
authors.initials: CF
authors.lastname: Lee
authors.forename: R C
authors.initials: RC
authors.lastname: Chen
mesh_terms: D000569:Americas; D003710:Demography; D019049:Developed Countries; D005843:Geography; D006297:Health Services Accessibility; D008962:Models, Theoretical; D009656:North America; D011153:Population; D011154:Population Characteristics; D011156:Population Density; D012106:Research; D014481:United States; D014505:Urban Population
keywords: Americas; Demographic Analysis; Demographic Factors; Developed Countries; Distance; Geographic Factors; Models, Theoretical; North America; Northern America; Population; Population Characteristics; Population Density; Research Methodology; Spatial Distribution; United States; Urban Population