Goymann, Wolfgang Abteilung Gahr, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society;
Goymann, W. (2005). Noninvasive monitoring of hormones in bird Droppings: Physiological validation, sampling, extraction, sex differences, and the influence of diet on hormone metabolite levels. Annals of the New York Academy of Sciences, 1046, 35-53. doi:10.1196/annals.1343.005.