Beiträge zur Algebra und Geometrie Contributions to Algebra and Geometry Vol. 49, No. 2, pp. 599605 (2008) 

Covering the unit cube by equal ballsAntal JoósCollege of Dunaújváros, 2400 Dunaújváros, Táncsics M. u. 1/a, Hungary, email: ajoos@kac.poliod.huAbstract: We give the minimal radius of $8$ congruent balls, which cover the $4$dimensional unit cube. Keywords: covering by equal balls, finite coverings Classification (MSC2000): 52C17 Full text of the article:
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