The high-pressure α/β phase transition in lead sulphide (PbS) - X-ray powder diffraction and quantum mechanical calculationsK. Knorr, L. Ehm, M. Hytha, B. Winkler and W. DepmeierEur. Phys. J. B, 31 3 (2003) 297-303DOI: https://doi.org/10.1140/epjb/e2003-00034-6