Lattice dynamics and elastic properties of PbF2 and BaF2 from quantum mechanical calculations A. Dubinin, B. Winkler, K. Knorr and V. Milman Eur. Phys. J. B, 39 1 (2004) 27-33 Published online: 18 June 2004 DOI: 10.1140/epjb/e2004-00166-1