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Acta Mathematica Scientia > 2010 > 30 > 5 > 1523-1528
Physics Procedia > 2010 > 3 > 5 > 1767-1774
Ecological Economics > 2002 > 40 > 3 > 421 - 440
Acta Mathematica Scientia > 2010 > 30 > 5 > 1523-1528
Physics Procedia > 2010 > 3 > 5 > 1767-1774
Ecological Economics > 2002 > 40 > 3 > 421 - 440