MATLOVIČ, René, KLAMÁR, Radoslav, KOZOŇ, Ján, IVANOVÁ, Monika and MICHALKO, Miloslav. Spatial polarity and spatial polarization in the context of supranational and national scales: regions of Visegrad countries after their accession to the EU. Bulletin of Geography. Socio-economic Series. Online. 29 August 2018. Vol. 41, no. 41, pp. 59-78. [Accessed 22 February 2025]. DOI 10.2478/bog-2018-0026.