1. Motor Oils and Engine Lubrication;Schilling,1968
2. Rerefined oil; an option that saves oil, minimizes pollution;Maugh;Science,1976
3. The lubricant market in the 1980s. US and the free world (AM-80-25);Stewart,1980
4. Quelques derivés du pétrole, Critères d'hygiène de l'environnement;Organisation Mondiale de la Santé,1980