2
Published in 1997
doi: 10.1016/S0375-6742(97)00016-2
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journal article online
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4
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5
Published in 1985
technical report
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6
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9
Published in 1987
doi: 10.1016/0375-6742(87)90072-0
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conference paper or compendium article online
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16
17
Published in 1989
journal article
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19
Published in 1987
journal article
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