6
Published in 1990
doi: 10.1127/ejm/2/1/0043
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11
Published in 1998
doi: 10.1007/s002690050097
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12
Published in 1998
doi: 10.1016/S0169-1317(98)00026-X
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14
Published in 1994
doi: 10.1016/0016-7037(94)90296-8
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20
Published in 2002
doi: 10.2138/am-2002-2-314
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