Insulator-metal transition shift related to magnetic polarons in La0.67-xYxCa0.33MnO3G. Li, S.-J. Feng, F. Liu, Y. Yang, R.-K. Zheng, T. Qian, X.-Y. Guo and X.-G. LiEur. Phys. J. B, 32 1 (2003) 5-11DOI: https://doi.org/10.1140/epjb/e2003-00068-8