1. Quantitative NMR (qNMR)—BIPM.
https://www.bipm.org/en/bipm/chemistry/organic-analysis/qnmr/
. Last Consulted 20 Feb 2018
2. Santosh KB, Raja R (2012) Quantitative 1H NMR spectroscopy. Trends Anal Chem 35:5–26
3. BIPM CCQM Working Group on Organic Analysis (OAWG).
https://www.bipm.org/en/committees/cc/wg/oawg.html
. Last Consulted 09 Feb 2018
4. Ph. Eur. Reference Standard FOLIC ACID CRS batch 8, information leaflet.
https://crs.edqm.eu/db/4DCGI/View=F0300000
. Last Consulted 06 Dec 2017
5. Ph. Int. Reference Standard FOLIC ACID ICRS batch 3, information leaflet.
https://crs.edqm.eu/db/4DCGI/View=ICRS0316
. Last Consulted 6 Dec 2017