NAZARCZUK, Jarosław M. and UMIŃSKI, Stanisław. The geography of openness to foreign trade in Poland: The role of special economic zones and foreign-owned entities. Bulletin of Geography. Socio-economic Series. Online. 1 March 2018. Vol. 39, no. 39, pp. 97-111. [Accessed 7 July 2024]. DOI 10.2478/bog-2018-0007.