4
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13
Published in 1980
doi: 10.1016/0301-9268(80)90038-8
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conference paper or compendium article online
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15
Published in 1980
doi: 10.1016/0301-9268(80)90002-9
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journal article online
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16
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20
Published in 1981
doi: 10.1306/212F7CBB-2B24-11D7-8648000102C1865D
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journal article online
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