1
Published in 1991
doi: 10.1016/0016-7037(91)90003-N
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12
Published in 1981
doi: 10.1016/0377-0273(81)90019-6
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14
Published in 2000
doi: 10.1016/S0012-821X(00)00197-7
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20
Published in 2003
doi: 10.1016/S0377-0273(03)00151-3
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