SOKOŁOWSKI, Dariusz and JAŻDŻEWSKA, Iwona. Zipf ’s Law for cities: estimation of regression function parameters based on the weight of American urban areas and Polish towns. Bulletin of Geography. Socio-economic Series. Online. 29 September 2021. No. 53, pp. 147-156. [Accessed 4 May 2024]. DOI 10.2478/bog-2021-0028.