Journal Article
Unsicker, S. B.; Renker, C.; Kahmen, A.; Spindler, S.; Buchmann, N.; Weisser, W. W.: Testing the efficiency of three
15N-labeled nitrogen compounds for indirect labeling of grasshoppers via plants in the field. Entomologia Experimentalis et Applicata
116 (3), pp. 219 - 226 (2005)