4
6
Published in 1990
doi: 10.1016/0016-7037(90)90040-R
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journal article online
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7
Published in 1990
doi: 10.1016/0377-0273(90)90075-Q
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9
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12
Published in 1991
journal article
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14
Published in 1993
doi: 10.1016/0301-9268(93)90066-B
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conference paper or compendium article online
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