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S. P. Franklin (1969)
Compositio Mathematica
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S. P. Franklin (1969)
Compositio Mathematica
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S. Franklin (1965)
Fundamenta Mathematicae
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Rishel, Thomas W. (1972)
Portugaliae mathematica
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Tironi, G., Isler, R.
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V. Kannan (1979)
Compositio Mathematica
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Charles E. Aull (1979)
Czechoslovak Mathematical Journal
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Yoshio Tanaka (1983)
Fundamenta Mathematicae
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V. Kannan (1980)
Fundamenta Mathematicae
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