41
Published in 1997
doi: 10.1016/S0377-0273(97)00029-2
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journal article online
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45
Published in 1985
technical report
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48
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49
55
Published in 1993
doi: 10.1144/sjg29010087
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journal article online
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56
Published in 1994
doi: 10.1016/0377-0273(94)90009-4
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conference paper or compendium article online
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