2
Published in 1986
doi: 10.1016/0022-0248(86)90410-0
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journal article online
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10
Published in 1995
doi: 10.1016/0024-4937(95)00008-4
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journal article online
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17
Published in 1988
doi: 10.1016/0301-9268(88)90028-9
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conference paper or compendium article online
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