Valence of manganese, in a new oxybromide compound, determined by means of electron energy loss spectroscopy J.L. Mansot, P. Leone, P. Euzen and P. PalvadeauMicrosc. Microanal. Microstruct., 5 2 (1994) 79-90DOI: https://doi.org/10.1051/mmm:019940050207900