Seifert, R., A. Lorenz, S. Osterloh, K. Henning, and S. Tischew. “Free-Range Grazing by Large Herbivores in Degraded Large-Scale Dry Sandy Grassland-Heathland Ecosystems”. Ecological Questions, vol. 21, July 2014, pp. 87-89, doi:10.12775/EQ.2015.015.