4
Published in 1991
doi: 10.1144/GSL.QJEG.1991.024.02.01
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journal article online
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6
Published in 2002
doi: 10.1016/S0169-1317(02)00108-4
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7
14
Published in 1995
doi: 10.1016/0169-1317(95)00013-T
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17
18
Published in 2000
doi: 10.1016/S0375-6742(00)00075-3
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