1. Freuler HC. Modified lubricating oil. US Patent Office 2,364,283 (2,364,283, United States, 1994) 4.
2. Freuler HC. Modified lubricating oil. US Patent Office 2,364,284 (2,364,284, United States, 1944) 6.
3. Chemistry of the aliphatic esters of thiophosphoric acids. I;Mastin;Journal of the American Chemical Society,1945
4. Basic zinc double salts of O,O-dialkyl phosphorodithioic acids;Wystrach;Journal of Organic Chemistry,1956
5. Basic zinc double salts of O,O-dialkyl hydrogen phosphorodithioates;Bacon;Journal of Organic Chemistry,1962