by J. H. Conway, E. M. Rains, N. J. A. Sloane
Canad. J. Math
http://www.research.att.com/~njas/doc/sim.ps
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Abstract:
Partial answers are given to two questions. When does a lattice contain a sublattice 0 of index N that is geometrically similar to? When is the sublattice "clean", in the sense that the boundary of the Voronoi cells for 0
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