10
Published in 1998
doi: 10.1016/S0016-7037(98)00083-0
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journal article online
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12
Published in 1991
doi: 10.1016/0883-2927(91)90030-S
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18
Published in 2000
doi: 10.1016/S0375-6742(00)00136-9
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conference paper or compendium article online
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