v31n2p89-95
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v31n2p78-88
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v31n2p55-63
v31n1p44-45
v31n1p44-45
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v31n1p31-40
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v31n1p24-30
v31n2p89-95
v31n2p78-88
v31n2p68-77
v31n2p64-67
v31n2p55-63
v31n1p44-45
v31n1p42-43
v31n1p41
v31n1p31-40
v31n1p24-30