1
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4
Published in 1995
doi: 10.1016/0375-6742(95)00023-2
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conference paper or compendium article online
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7
Published in 1990
doi: 10.1016/0377-0273(90)90073-O
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journal article online
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12
Published in 1990
doi: 10.1016/0375-6742(90)90066-J
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journal article online
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19
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