1
Published in 1991
technical report
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4
Published in 1993
technical report
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9
Published in 1985
map
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11
Published in 1989
doi: 10.1016/0375-6742(89)90059-9
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conference paper or compendium article online
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14
Published in 1990
doi: 10.1016/0375-6742(90)90066-J
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journal article online
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