1
6
Published in 1982
journal article
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7
Published in 1986
doi: 10.1016/0375-6742(86)90063-4
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journal article online
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8
Published in 1986
doi: 10.1144/gsjgs.143.1.0089
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conference paper or compendium article online
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17
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18
Published in 1981
conference paper or compendium article
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