Mapping of physiological and trace elements with X-PEEM B.H. Frazer, B.R. Sonderegger, B. Gilbert, K.L. Richter, C. Salt, L.M. Wiese, D. Rajesh, S.P. Howard, J.F. Fowler, M.P. Mehta et G. De Stasio J. Phys. IV France, 104 (2003) 349-352 DOI: 10.1051/jp4:200300097