Experimental estimation of the cooperative Jahn-Teller energy in orbitally ordered KCu0.8Mg0.2F3 perovskiteM. Scavini, M. Brunelli, C. Ferrero, C. Mazzoli and P. GhignaEur. Phys. J. B, 65 2 (2008) 187-190DOI: https://doi.org/10.1140/epjb/e2008-00338-y