1. Institute of Wood Biology and Wood Technology, University of Göttingen, Büsgenweg 4,37077 Göttingen, Germany
2. Forest Service, Forest Products Laboratory, U.S. Department of Agriculture, One Gifford Pinchot Drive, Madison, WI 53705-2398
3. Naval Facilities Engineering Service Center, 1100 23rd Avenue, Port Hueneme, CA 93043
4. Wood Materials and Engineering Laboratory, Washington State University, Pullman, WA 99164-1806