Leithe-Jasper, A., Schnelle, W., Geibel, C., & Rosner, H. (2008). Superconducting State in SrFe2-xCoxAs2 by Internal Doping of the Iron Arsenide Layers. Physical Review Letters, 101: 207004, pp. 207004-1-207004-4. doi:10.1103/PhysRevLett.101.207004.