Pollheimer, Martin Vogelwarte Radolfzell, Radolfzell, Max Planck Institut für Ornithologie, Max Planck Society;
Sauberer, N., Zulka, K. P., Abensperg-Traun, M., Berg, H.-M., Bieringer, G., Milasowszky, N., et al. (2004). Surrogate taxa for biodiversity in agricultural landscapes of eastern Austria. Biological Conservation, 117, 181-190. doi:10.1016/S0006-3207(03)00291-X.