1
Published in 2000
doi: 10.1017/S0016756800003538
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6
Published in 1987
doi: 10.1306/948878F2-1704-11D7-8645000102C1865D
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13
Published in 1989
conference paper or compendium article
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16
Published in 1982
doi: 10.1016/0191-8141(82)90025-6
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