4
Published in 1985
doi: 10.1016/0012-821X(85)90095-0
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5
Published in 1987
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12
Published in 1993
doi: 10.1016/0377-0273(93)90054-U
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15
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18
Published in 1989
doi: 10.1016/0377-0273(89)90043-7
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19
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