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7. REFERENCES
1. Albert Rockwell, F. (1910) 'Pneumatic Spring' - United states patent office companyI US 962246 A.
2. Randall Falk, G. (2003) 'Motor front wheel suspension system having pneumatic springs' - United states patent office companyI US 6533305 B1.
3. Bachrach, B.I. (1981) 'Analysis of damped pneumatic pneumatic spring'
- Journal of Sound and Vibration.
4. Kent Fulks (1993) 'Compact weight lifting machine' - United states patent office companyI US 5540530 A.