On the nature of grain boundaries in the colossal magnetoresistance manganitesJ. Klein, C. Höfener, S. Uhlenbruck, L. Alff, B. Büchner and R. GrossEurophys. Lett., 47 3 (1999) 371-377DOI: https://doi.org/10.1209/epl/i1999-00398-1