P. S. Cea and D. Cetama/, Technical Note, Summary of the "EQRAIN traces n°21" proficiency test by inter-laboratory comparison, 2017.

, NF ISO 13528, Statistical methods for use in proficiency testing by interlaboratory comparison, 2015.

, NF ISO 5725-2, Application of statistics -Accuracy (trueness and precision) of measurement methods and results -Basic method for the determination of repeatability and reproducibility of a standard measurement method, 1998.