1. https://www.cleaninginstitute.org/sites/default/files/research- pdfs/Physical_properties_of_glycerine_and_its_solutions.pdf, “Physical Properties of Glycerine and its solutions”
2. R. Douglas Hudgens, Richard D. Hercamp and Jaime Francis, "An Evaluation of Glycerin (Glycerol) as a Heavy-Duty Engine Antifreeze/Coolant Base” SAE Technical Paper 2007-01-4000
3. ASTM D7640 Standard Specification for Engine Coolant Grade Glycerin
4. ASTM D7714 Standard Specification for Glycerin Base Engine Coolant for Automobile and Light Duty Service
5. GMW3420 Ethylene Glycol Based Extended Life Automotive Coolant