6
Published in 1991
conference paper or compendium article
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7
Published in 2000
doi: 10.1016/S0191-8141(00)00084-5
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11
Published in 2004
doi: 10.1180/0026461046820189
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journal article online
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13
Published in 2004
doi: 10.1180/0026461046820193
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journal article online
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