1. Definition from the impending international adoption of DIN 54190-3 (Non-destructive testing – Thermographic testing – Part 3: Terms and definitions).

2. http://www.bipm.org/en/about-us/ [Retrieved 2017-01-31.]

3. http://jcgm.bipm.org/vim/en/2.39.html [Retrieved 2017-01-31.]

4. http://jcgm.bipm.org/vim/en/4.30.html [Retrieved 2017-01-31.]

5. http://jcgm.bipm.org/vim/en/4.31.html [Retrieved 2017-01-31.]