1. Ledvina T. J. and Hummel J. A. Randomized Sprocket for Roller Chain, European Patent #EP0907041 (2002).
2. Payet P. R. Process and Conveyor Device for Feeding Sugar Cane in a Mill Train, U. S. Patent #3, 120,173 (1964).
3. White D. C. and Fraboni H. J. Roller Chain Sprockets Oriented to Minimize Strand Length Variation, United States Patent #6213905(2001).
4. Moster A. and Ledvina T. J. Roller Chain Link Plate Profile, European Patent #EP0833078(2003).
5. Static Stress Analysis of Link Plate of Roller Chain using Finite Element Method and Some Design Proposals for Weight Saving