1
Published in 1998
doi: 10.1016/S0375-6742(97)00046-0
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journal article online
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12
Published in 1999
doi: 10.1016/S0375-6742(99)00032-1
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conference paper or compendium article online
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17
Published in 1999
doi: 10.1016/S0375-6742(99)00025-4
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18