6
Published in 1991
doi: 10.1016/0883-2927(91)90004-9
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journal article online
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7
Published in 1986
doi: 10.1016/0883-2927(86)90039-9
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journal article online
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8
Published in 1999
doi: 10.1016/S0375-6742(99)00076-X
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conference paper or compendium article online
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