Natural Resources Research
Natural Resources Research > 2005 > 14 > 4 > 325-332
Natural Resources Research > 2009 > 18 > 2 > 137-151
Natural Resources Research > 2011 > 20 > 4 > 231-249
Natural Resources Research > 2005 > 14 > 4 > 325-332
Natural Resources Research > 2009 > 18 > 2 > 137-151
Natural Resources Research > 2011 > 20 > 4 > 231-249