6
Published in 1981
doi: 10.1016/0012-821X(81)90096-0
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journal article online
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11
Published in 1990
doi: 10.1016/0883-2927(90)90009-T
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journal article online
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12
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14
Published in 1987
doi: 10.1016/0301-9268(87)90064-7
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conference paper or compendium article online
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17