6
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9
Published in 1998
doi: 10.2138/am-1998-9-1008
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10
Published in 1998
doi: 10.1016/S0012-821X(98)00205-2
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16
Published in 1994
doi: 10.1306/A25FE423-171B-11D7-8645000102C1865D
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