1. Balasubramanian N, Steward KF (2019) Biodiesel: history of plant based oil usage and modern innovations. Substantia 3(2):57–71
2. Chavanne CG (1938) Belgian Patent 422,877, Aug 31, 1937; Chem Abs 32:4313
3. Clark SJ, Wagner LW, Schrock MI, Piennaar EG (1984) Methyl and ethyl soybean esters as renewable fuels for diesel engines. JAOCS 61:1632–1638
4. Diesel R (1895) Method of and apparatus for converting heat into work. US Patent 542,846. http://www.google.com/patents/US542846
5. Diesel R (1898) Internal combustion engine. US Patent 607,845. http://www.google.com/patents/US608845