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Gröchenig, K., Heil, C. andWalnut, D., Nonperiodic sampling and the local three squares theorem,Ark. Mat.,38 (2000), 77–92.
Levin, B. Ya., On bases of exponential functions inL 2 (−π, π),Zap. Mekh.-Mat. Fak. i Khar'kov Mat. Obshch.,27 (1961), 39–48 (Russian).
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Seip, K. On Gröchenig, Heil, and Walnut's proof of the local three squares theorem. Ark. Mat. 38, 93–96 (2000). https://doi.org/10.1007/BF02384492
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DOI: https://doi.org/10.1007/BF02384492