1
Published in 1985
technical report
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6
Published in 1988
doi: 10.1016/0304-4203(88)90105-3
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conference paper or compendium article online
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16
Published in 1992
conference paper or compendium article
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18
Published in 1997
doi: 10.1127/njmm/1997/1997/163
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journal article online
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