5
Published in 1980
doi: 10.1016/0301-9268(80)90022-4
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conference paper or compendium article online
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8
Published in 1981
doi: 10.1016/0012-821X(81)90076-5
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journal article online
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15
Published in 1998
doi: 10.1016/S0377-0273(98)00070-5
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journal article online
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