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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 7, No. 4, pp. 731–739, July–August, 1966.
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Baranovskii, E.P., Ryshkov, S.S. On A second local minimum of the density of the lattice covering of a four-dimensional Euclidean space by similar spheres. Sib Math J 7, 583–590 (1966). https://doi.org/10.1007/BF00973257
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DOI: https://doi.org/10.1007/BF00973257