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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.

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.

Potts, P.J. and Webb, P.C. and Thompson, Michael (2013) An assessment of performance in the routine analysis of silicate rocks based on an analysis of data submitted to the GeoPTProficiency testing programme for geochemical laboratories (2001-2011). Geostandards and Geoanalytical Research 37 (4), pp. 403-416. ISSN 1639-4488.