4
Published in 1998
doi: 10.1016/S0375-6742(98)00053-3
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12
Published in 2001
doi: 10.1016/S1464-1909(01)00081-8
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18
Published in 2005
doi: 10.1144/sjg41010061
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20
Published in 2005
doi: 10.1007/s00445-004-0357-7
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