6
Published in 1985
doi: 10.1016/0375-6742(85)90043-3
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7
Published in 1986
doi: 10.1016/0375-6742(86)90082-8
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14
Published in 1989
doi: 10.1016/0375-6742(89)90048-4
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15
Published in 1987
doi: 10.1016/0009-2541(87)90105-7
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19
Published in 2007
doi: 10.1080/08120090701488289
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20
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