Universal critical behavior in polycrystalline La0.75Ca0.25-xNaxMnO3 (x = 0.00; 0.05) samplesSouhir Bouzidi, Manel Dhahri, J. Dhahri and E. K. HlilEur. Phys. J. Plus, 136 1 (2021) 23DOI: https://doi.org/10.1140/epjp/s13360-020-00958-9