[Wu, Zhige] Cent South Univ Forestry & Technol, Bangor Coll, 498 Shaoshan Rd South, Changsha 410004, Hunan, Peoples R China.
[Maynard, Alex] Univ Guelph, Dept Econ & Finance, Guelph, ON, Canada.
[Maynard, Alex] Univ Toronto, Fac Forestry, Toronto, ON, Canada.
[Weersink, Alfons; Hailu, Getu] Univ Guelph, Dept Food Agr & Resource Econ, Guelph, ON, Canada.
[Weersink, Alfons] Univ Western Australia, Sch Agr & Resource Econ, Crawley, Australia.