@INPROCEEDINGS {LANGEWALD:2001, title = {Large-scale environmental impact of biological control and the future of grasshopper control on Orthopteroid insects}, author = {Langewald, J. and Stolz, R. }, booktitle = {International Conference on Orthopteroid Insects, 19-22 August}, year = {2001}, location = {Montpellier, France}, }