1. C Goodyear, inventor, U.S. Patent 3, 633 (1844).
2. C Goodyear, inventor, U.K. Patent 2, 933 (1853).
3. 3. U.S. Scrap Tire Markets 2001, Scrap Tire Management Council.
4. Scrap Tire Stockpile Abatement,2002
5. Scrap Tyres: Disposal and Reuse;Snyder,1998