Ciupa, Tadeusz, et al. “Morphological and Soil Determinants of Forest Cover Changes in Świętokrzyski National Park and Its Buffer Zone in the Last 200 Years”. Quaestiones Geographicae, vol. 34, no. 1, Mar. 2015, pp. 55-63, doi:10.1515/quageo-2015-0005.