Żółkoś, K., & Markowski, R. (2006). Pressure of the Grey Heron breeding colony (Ardea cinerea) on the phytocoenosis of lowland acidophilous beech forest in the „Czapliniec w Wierzysku” reserve (Kaszubskie Lake District). Biodiversity: Research and Conservation, (3-4), 337–339. https://doi.org/10.14746/biorc.2006.3-4.31