^Elżbieta Zuzańska-Żyśko: Metropolitan functions of the Upper-Silesian Metropolitan Area, p. 61 – "The purpose of the article is to study metropolitan functions, as well as to analyze the intrinsic structure of the Upper-Silesian Metropolitan Area, which used to be an industrial conurbation that evolved into a polycentric settlement arrangement. (...) The selected functional metropolitan area is formed by 15 municipalities, including 13 towns with county rights, and is inhabited by 1.9 million people. (...) The metropolitan centre of utmost importance and holding well-developed metropolitan functions is the city of Katowice, whereas Gliwice and Chorzów are first-class auxiliary centres."
^Elżbieta Zuzańska-Żyśko: The Upper-Silesian conurbation on the path towards the “Silesia” metropolis, p. 119-120 – "(...) an attempt was made to delimit the Upper-Silesian Metropolitan Area (GOM) and to define its inner structure (Fig. 1)(Zuzańska-Żyśko, 2011). (...). It is a group of 14 centres with the highest population and rank. These cities simultaneously create a voluntary municipal union named the Metropolitan Association of Upper-Silesia (GZM). These cities create the core of the future metropolis. All the adjacent boroughs make the outer metropolitan zone."
^Zuzańska-Żyśko, Elżbieta. "Funkcje metropolitalne w Górnośląskim Obszarze Metropolitalnym". Studia Regionalne i Lokalne (in Polish). 2 (2012 ed.). Centrum Europejskich Studiów Regionalnych i Lokalnych Uniwersytetu Warszawskiego: 39. ISSN1509-4995.
^Cite error: The named reference ESPON was invoked but never defined (see the help page).
^Spórna, Tomasz; Kantor-Pietraga, Iwona; Krzysztofik, Robert (2016-03-20). "Trajectories of depopulation and urban shrinkage in the Katowice Conurbation, Poland". Espace populations sociétés. 2015/3-2016/1 (2016): 2. Retrieved 2024-07-03. Katowice conurbation, together with the agglomerations of Kraków, Rybnik, Bielsko-Biała and Częstochowa and the agglomeration of Ostrava in the Czech Republic, make up an interstate agglomeration zone