@Misc{ KreFri19, author = { Friedrich, Manuel and Kreutz, Leonard }, title = { Crystallization in the hexagonal lattice for ionic dimers }, journal = { Math. Mod. Meth. Appl. Sci. (M3AS) }, year = { 2018 }, pages = { }, URL = { http://cvgmt.sns.it/paper/4243/ }, note = { cvgmt preprint} }