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Potts, P.J. and Webb, P.C. and Thompson, Michael (2015) Bias in the determination of Zr, Y and rare earth element concentrations in selected silicate rocks by ICP-MS when using some routine acid dissolution procedures: evidence from the GeoPT proficiency testing programme. Geostandards and Geoanalytical Research 39 (3), pp. 315-327. ISSN 1639-4488.

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Thompson, Michael and Webb, P.C. and Potts, P.J. (2015) The GeoPT proficiency testing scheme for laboratories routinely analysing silicate rocks: a review of the operating protocol and proposals for its modification. Geostandards and Geoanalytical Research 39 (4), pp. 433-442. ISSN 1639-4488.