Structure and physical properties of the new layered oxypnictides Sr4Sc2O6M2As2 (M = Fe and Co)Y. L. Xie, R. H. Liu, T. Wu, G. Wu, Y. A. Song, D. Tan, X. F. Wang, H. Chen, J. J. Ying, Y. J. Yan, Q. J. Li and X. H. ChenEPL, 86 5 (2009) 57007DOI: https://doi.org/10.1209/0295-5075/86/57007