Károly Bezdek, 32, Lectures on Sphere Arrangements – the Discrete Geometric Side, 2013, 1
William Dickinson, Daniel Guillot, Anna Keaton, Sandi Xhumari, “Optimal packings of up to six equal circles on a triangular flat torus”, J. Geom., 102, no. 1-2, 2011, 27
Károly Bezdek, “Sphere packings revisited”, European Journal of Combinatorics, 27, no. 6, 2006, 864
Robert Connelly, Konstantin Rybnikov, Stanislav Volkov, “Percolation of the Loss of Tension in an Infinite Triangular Lattice”, Journal of Statistical Physics, 105, no. 1-2, 2001, 143