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Conway, J.H. and Sloane, N.J.A. (1993) Sphere Packings, Lattices and Groups. New-York, Springer-Verlag (The Maximum Packing Density Was Hypothesized by Johannes Kepler in 1611 and C.F. Gauss Proved the Lemma for Lattices. While the Perfect Proof for Every Type of Packing Is Still Missing).

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