1. Mutual recognition of national measurement standards and of calibration and measurement certificates issued by national metrology institutes,2003
2. BIPM key comparison database,2021
3. The ILAC Mutual Recognition Arrangement, ILAC B7:10/2015, 2015, URL.
4. Measurement comparisons in the CIPM MRA – Guidelines for organizing, participating and reporting, CIPM MRA-G-11, 2021, URL.
5. Conformity Assessment - General Requirements for Proficiency Testing,2010