International
Tables for
Crystallography
Volume C
Mathematical, physical and chemical tables
Edited by E. Prince

International Tables for Crystallography (2006). Vol. C, ch. 9.2, p. 752

Figure 9.2.1.1 

D. Pandeyc and P. Krishnab
[Figure 9.2.1.1]
Figure 9.2.1.1

The close packing of equal spheres in a plane.