11
Published in 1995
doi: 10.1016/0883-2927(94)00036-6
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journal article online
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15
Published in 1999
doi: 10.1016/S0883-2927(98)00092-4
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journal article online
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18
Published in 1989
doi: 10.1016/0883-2927(89)90024-3
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conference paper or compendium article online
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