Benjamin Berkels Andreas Rätz Martin Rumpf Axel Voigt Extracting Grain Boundaries and Macroscopic Deformations from Images on Atomic Scale. 1-23 2008 35 J. Sci. Comput. 1 http://dx.doi.org/10.1007/s10915-007-9157-5 db/journals/jscic/jscic35.html#BerkelsRRV08