2
Published in 1997
doi: 10.1016/S0375-6742(97)00016-2
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journal article online
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5
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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17
Published in 1990
doi: 10.1016/0009-2541(90)90130-Y
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