6
Published in 1987
doi: 10.1016/0883-2927(87)90056-4
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conference paper or compendium article online
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7
Published in 1997
doi: 10.1016/S0883-2927(96)00038-8
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journal article online
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8
Published in 1995
doi: 10.1016/0883-2927(94)00036-6
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journal article online
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