1
Published in 1994
doi: 10.1016/0375-6742(94)90015-9
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journal article online
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5
Published in 1990
doi: 10.1016/0375-6742(90)90066-J
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journal article online
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17
Published in 1984
doi: 10.1016/0375-6742(84)90066-9
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conference paper or compendium article online
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