5
Published in 1999
doi: 10.1016/S0375-6742(99)00038-2
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6
Published in 1993
doi: 10.1016/0375-6742(93)90056-R
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10
11
Published in 2001
doi: 10.1016/S0375-6742(01)00156-X
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12
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19
Published in 2005
doi: 10.2138/am.2005.1816
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