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doi:10.1017/S0023921600019927

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Volume 27, Issue 1
DOI: https://doi.org/10.1017/S0023921600019927

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Volume 27, Issue 1
DOI: https://doi.org/10.1017/S0023921600019927

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Volume 27, Issue 1
DOI: https://doi.org/10.1017/S0023921600019927

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