4
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6
Published in 1982
doi: 10.1016/0191-8141(82)90024-4
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conference paper or compendium article online
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14
Published in 1999
doi: 10.1016/S0191-8141(99)00024-3
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journal article online
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20
Published in 1991
doi: 10.1144/gsjgs.148.1.0055
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journal article online
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