Geodesic
Placement of points on a~torus and in a~plane
Trudy Instituta matematiki i mehaniki, Function theory, Tome 11 (2005) no. 2, pp. 196-200

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Estimates from above of cardinality of codes on a torus are given. For a special type of lattice spirals their packing radius is determined and covering radius is estimated. 
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     author = {V. A. Yudin},
     title = {Placement of points on a~torus and in a~plane},
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V. A. Yudin. Placement of points on a~torus and in a~plane. Trudy Instituta matematiki i mehaniki, Function theory, Tome 11 (2005) no. 2, pp. 196-200. http://geodesic.mathdoc.fr/item/TIMM_2005_11_2_a14/