1. Green lubricants — the lubricants developing trend of 21st century;Li;Hecheng Runhua Cailiao,1997
2. Additives for biodegradable lubricants;Kroff;NLGI Spokesman,1993
3. The aspects of designing lubricants using an environmental product assessment;Sander;NLGI Spokesman,1997
4. Making a case for soy-based lubricants;Honary;Lubr. Eng.,1998
5. Environmentally harmless lubricants;Mang;NLGI Spokesman,1993