1. Tang QQ, Li FH, Chen HY, Yin XJ, Tang Y, Zeng QL (2021) Asian J Org Chem 10:1687
2. Sun SF, He ZP, Huang MD, Wang NN, He ZZ, Kong XK, Yao JW (2018) Bioorg Med Chem 2018:2381
3. Devendar P, Yang GF (2017) Topics Curr Chem 375:82
4. Watts RF, Noles JR, Gorda KR, Cogen KL (2009) Lubricating oils having improved friction stability. US Patent 20090005277A1 Jan 01 2009; (2009) Chem Abstr 150:101563
5. Puckace JS (1998) Oil soluble complexes of phosphorus-free strong mineral acids useful as lubricating oil additives. US Patent 5,785,881, Jul 28, 1998; (1996) Chem Abstr 125:119276