On the Densest Packing of Equal Spheres in a Cube

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[2]  J. Schaer.  The Densest Packing of 9 Circles in a Square , 1965, Canadian Mathematical Bulletin.

[3]  J. Schaer.  On the Densest Packing of Spheres in a Cube , 1966, Canadian Mathematical Bulletin.

[4]  A. Meir,et al.  On a Geometric Extremum Problem , 1965, Canadian Mathematical Bulletin.