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[3]
Liu A. C. F., 1979, MATH MAG, V52, P232
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Reeve J.E., 1957, P LOND MATH SOC 3, V7, P378, DOI 10.1112/plms/s3-7.1.378
[6]
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[7]
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[8]
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[9]
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[10]
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