A possible model for the positive magnetoresistance in manganite-based all-perovskite oxide films p-n junctionD. J. Wang, Y. W. Xie, C. M. Xiong, B. G. Shen and J. R. SunEurophys. Lett., 73 3 (2006) 401-407DOI: https://doi.org/10.1209/epl/i2005-10411-9