Natural Resources Research
Natural Resources Research > 2000 > 9 > 3 > 215-222
Natural Resources Research > 2006 > 15 > 4 > 271-281
Natural Resources Research > 2009 > 18 > 3 > 181-191
Natural Resources Research > 2000 > 9 > 3 > 215-222
Natural Resources Research > 2006 > 15 > 4 > 271-281
Natural Resources Research > 2009 > 18 > 3 > 181-191