Charge states of transition metal in "Cr, Co and Ni" doped Ln0.5Ca0.5MnO3 CMR manganitesO. Toulemonde, F. Studer, A. Barnabé, A. Maignan, C. Martin and B. RaveauEur. Phys. J. B, 4 2 (1998) 159-167DOI: https://doi.org/10.1007/s100510050364