Natural Resources Research
Natural Resources Research > 2011 > 20 > 2 > 103-116
Natural Resources Research > 2011 > 20 > 2 > 131-142
Natural Resources Research > 2011 > 20 > 2 > 89-93
Natural Resources Research > 2011 > 20 > 2 > 95-101
Natural Resources Research > 2011 > 20 > 2 > 117-129