1. H. T. Alborn, T. C. J. Turlings, J. H. Loughrin, J. H. Tumlinson, Center for Medical, Agricultural, and Veterinary Entomology, United States Department of Agriculture, Agricultural Research Service, 1700 Southwest 23rd Drive, Gainesville, FL 32608, USA.
2. T. H. Jones, Department of Chemistry, Virginia Military Institute, Lexington, VA 24450, USA.
3. G. Stenhagen, Department of Organic Chemistry, Chalmers University of Technology, S-412 96 Göteborg, Sweden.