High pressure Raman study of La1-xCaxMnO3-δ manganites A. Sacchetti, T. Corridoni, E. Arcangeletti and P. Postorino Eur. Phys. J. B, 66 3 (2008) 301-305 Published online: 04 December 2008 DOI: 10.1140/epjb/e2008-00441-1