Optical indication of metallic clusters in the layered manganites above N. N. Loshkareva, E. V. Mostovshchikova, N. I. Solin, Yu. P. Sukhorukov, S. N. Tugushev and S. V. NaumovEurophys. Lett., 76 5 (2006) 933-937DOI: https://doi.org/10.1209/epl/i2006-10345-8