Electrical resistivity behaviour of sodium substituted manganites: electron-phonon, electron-electron and electron-magnon interactionsD. Varshney, D. Choudhary, M. W. Shaikh and E. KhanEur. Phys. J. B, 76 2 (2010) 327-338DOI: https://doi.org/10.1140/epjb/e2010-00192-4