Mössbauer study of magnetic fluctuation in the iron-arsenic layer of Sr2VO3FeAs X.-M. Ma, J.-M. Wan, J.-P. Liu, H. Pang and F.-S. Li EPL, 105 3 (2014) 37002 Published online: 17 February 2014 DOI: 10.1209/0295-5075/105/37002