A new low-temperature state in a La-modified lead zirconate titanate relaxorR. Farhi, M. El Marssi, J.-L. Dellis, M. D. Glinchuk and V. A. StephanovichEurophys. Lett., 46 3 (1999) 351-356DOI: https://doi.org/10.1209/epl/i1999-00268-x