On Functions with Zero Mean over a Finite Group
Funkcionalʹnyj analiz i ego priloženiâ, Tome 31 (1997) no. 1, pp. 93-94.

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S. L. Tabachnikov. On Functions with Zero Mean over a Finite Group. Funkcionalʹnyj analiz i ego priloženiâ, Tome 31 (1997) no. 1, pp. 93-94. http://geodesic.mathdoc.fr/item/FAA_1997_31_1_a13/

[1] Arnold V. I., Almost Sign-Preserving Trigonometric Polynomials, Preprint, 1996 | MR

[2] Babenko A. G., Matem. zametki, 35:3 (1984), 349–356 | MR | Zbl