Geodesic
Estimating the cardinality of a~difference subset of the discrete multi-torus~$\mathbb Z^n_3$
Fundamentalʹnaâ i prikladnaâ matematika, Tome 16 (2010) no. 6, pp. 23-32

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In this paper, we obtain an upper estimate for the cardinality of a subset of the discrete torus over a field of three elements of which any four points do not form a nonsingular parallelogram. 
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     title = {Estimating the cardinality of a~difference subset of the discrete multi-torus~$\mathbb Z^n_3$},
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E. P. Davletyarova; A. A. Zhukova; A. A. Yudin. Estimating the cardinality of a~difference subset of the discrete multi-torus~$\mathbb Z^n_3$. Fundamentalʹnaâ i prikladnaâ matematika, Tome 16 (2010) no. 6, pp. 23-32. http://geodesic.mathdoc.fr/item/FPM_2010_16_6_a2/