8
Published in 1996
doi: 10.1016/S0375-6742(96)00017-9
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conference paper or compendium article online
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12
Published in 1998
doi: 10.1016/S0012-821X(98)00159-9
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journal article online
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16
Published in 1981
doi: 10.5382/AV75.13
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monograph online
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18
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