SUPERIOR SPATIAL RESOLUTION IN CONFOCAL X-RAY TECHNIQUES USING COLLIMATING CHANNEL ARRAY OPTICS: ELEMENTAL MAPPING AND SPECIATION IN ARCHAEOLOGICAL HUMAN BONE Article Choudhury S., George G.N., Pickering I.J., Agyeman-Budu D.N., Woll A.R., Swanston T., Varney T.L., Cooper D.M.L., Hallin E., Coulthard I. Journal of Analytical Atomic Spectrometry. Royal Society of Chemistry. Vol. 32. 2017. P. 527-537