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To Prof.C. L. Siegel on his 70'th birthday
This work has been partially supported by the Office of Naval Research, Washington, D. C., U.S.A.
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Mordell, L.J. The diophantine equationz 2=ax 4+2bx 2 y 2+cy 4 . Math. Ann. 168, 138–141 (1967). https://doi.org/10.1007/BF01361549
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DOI: https://doi.org/10.1007/BF01361549