1. BS EN 590:2013+A1:2017 automotive fuels. Diesel. Requirements and test methods May 2017.
2. Council regulation (EEC) No 2658/87 of 23 July 1987 on the tariff and statistical nomenclature and on the common customs tariff;Off. J. Eur. Union L,1987
3. ASTM D94-07 (2017). Standard test methods for saponification number of petroleum products. July 10, 2017.
4. Commission implementing regulation (EU) 2018/125 of 24 January 2018 amending annex I to council regulation (EEC) No 2658/87 on the tariff and statistical nomenclature and on the common customs tariff;Off. J. Eur. Union L,2018