4
Published in 1989
doi: 10.1038/342889a0
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journal article online
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6
Published in 1991
doi: 10.1038/352614a0
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journal article online
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11
Published in 1989
journal article
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14
Published in 1992
doi: 10.1016/0012-821X(92)90023-O
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15
18
Published in 1992
doi: 10.1016/0016-7037(92)90044-J
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conference paper or compendium article online
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20
Published in 1990
conference paper or compendium article
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