Superconductivity in (LaCex)(O0.9F0.1)FeAs and (LaPbx)OFeAsR. C. Che, L. Wang, Z. Chen, C. Ma, C. Y. Liang, J. B. Lu, H. L. Shi, H. X. Yang and J. Q. LiEPL, 83 6 (2008) 66005DOI: https://doi.org/10.1209/0295-5075/83/66005