1
Published in 1997
doi: 10.1016/S0024-4937(97)00034-0
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journal article online
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7
Published in 2000
doi: 10.1016/S0012-8252(00)00020-9
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18
Published in 2001
doi: 10.1016/S0191-8141(00)00172-3
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conference paper or compendium article online
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20
Published in 1999
doi: 10.1016/S0191-8141(99)00110-8
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