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2. The Nature of Order: An essay on the art of building and the nature of the universe;Alexander,2002
3. What is special about spatial data: Alternative perspectives on spatial data analysis;Anselin,1989
4. Zipf’s law and city size distribution: a survey of the literature and future research agenda;Arshad;Physica A,2018
5. The size, scale, and shape of cities;Batty;Science,2008