6
by Di Zhou
Published in 1985
doi: 10.1016/0375-6742(85)90046-9
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journal article online
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14
Published in 1996
doi: 10.1016/S0375-6742(96)00035-0
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journal article online
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16
Published in 1997
doi: 10.1016/S0375-6742(97)00027-7
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conference paper or compendium article online
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