Ratyńska, Halina, et al. “Xerothermic and Anthropophytic Species Populations in the Grassland Communities of ‘Skarpy Ślesińskie’ Nature Reserve and Its Surroundings”. Biodiversity: Research and Conservation, no. 3-4, Dec. 2006, pp. 381-5, doi:10.14746/biorc.2006.3-4.41.