1. 1. V. Anusha Rani “Automatic Dual Line Lubrication of 1400 Litre Excavator Machine using PLC”, International Journal of Innovative Research in Science, Engineering and Technology, ISSN (Online): 2319-8753, ISSN (Print): 2347-6710, Vol. 6, Issue 7, July 2017.
   2. Gade S.V., Waghmare S.L., Wagh P.R., Baheti.A.S. “Review of Automatic Lubrication System”, International Journal of Engineering Technology, Management and Applied Sciences, ISSN: 2349-4476, Volume 3 Issue 3, pp.226-230 March 2015.
   3. T. Elakkiya, A. Anitta “Comparative Study of Manual Lubrication and Automatic Lubrication”, Int. Journal of Engineering Research and Applications, ISSN: 2248-9622, Vol. 5, Issue 2, (Part -4), pp.16-20, February 2015.
   4. H. Mikami: "Latest Trends in Lifespan Prediction for Lubrication Grease and Grease," Hydraulics & Pneumatics (Japan) 576, Vol.46, No.11, pp.42- 46, 2007.
   5. Analysis of Fault-Tolerant systems, “IEEE transactions on Computers”, Vol.38, No.6, pp.134-138, 1989.
   6.  Scarlett, N.A. (1967), “Use of Grease in Rolling Bearings,” Proc. IMechE. Part 3A, 182, pp.167-171
   7.  S. A. McKee, T. R. McKee, "Pressure distribution in oil films of journal bearings", Trans. ASME, vol. 54, pp. 149-165, 1932.