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This work was done at Yale University. Financial support from the Swiss N.F. for scientific research.
The author is grateful to the referee for valuable comments on organizing the results, for additional details and simplification in the proof of Theorem 1.
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Hürlimann, W. H 3 and rational points on biquadratic bicyclic norm forms. Arch. Math 47, 113–116 (1986). https://doi.org/10.1007/BF01193679
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DOI: https://doi.org/10.1007/BF01193679