Affiliation: | 1.Southern Swedish Forest Research Center, Swedish University of Agricultural Sciences, P.O. Box 49, 230 53, Alnarp, Sweden ;2.U.S. Forest Service, Northern Research Station, P.O. 202, Anheuser-Busch Natural Resources Bldg., Columbia, MO, 65211, USA ;3.School of Agricultural and Forestry Engineering, University of Cordoba, Edf. Leonardo da Vinci, Campus de Rabanales, 14071, Cordoba, Spain ;4.Department of Forestry and Natural Resources, Hardwood Tree Improvement and Regeneration Center, Purdue University, West Lafayette, IN, 47907-2061, USA ; |