Interaction between two structural blocks and its correlation with superconductivity in SmFeAsO1-xFx and SmFe1-xMxAsO (M = Co,Ni)L. Zhang, Y. K. Li, Q. Tao, S. L. Shi, X. Y. Wang and Y. ZhouEPL, 91 5 (2010) 56005DOI: https://doi.org/10.1209/0295-5075/91/56005