CZYŻEWSKI, Bazyli, LIS, Piotr and CZYZEWSKA, Izabela. Integrating the rent gap into the ground rent theory. Measurement and implications for different models of agriculture. Bulletin of Geography. Socio-economic Series. Online. 29 March 2024. No. 63, pp. 87-98. [Accessed 29 June 2025]. DOI 10.12775/bgss-2024-0007.