1. Bayer O, Siefken W, Rinke H, Orthner L, Schild H. A process for the production of polyurethanes and polyureas, 1937; German Patent DRP 728981.
2. Polymeric materials of the future based on renewable plant resources and biotechnologies: fibres, films, plastics;Perepelkin;Fibre Chem,2005
3. Eco-innovations in floor-covering materials: bio-based elastomeric materials based on castor oil;Tian;Proc 11th Ann Green Chem Eng Conf,2007
4. Ardakani AA, Gelorme JD, Kosbar LL. Cross-linked biobased materials and uses thereof, 1998; US Patent 5,833,883.
5. Addition polymers from natural oils—a review;Sharma;Progr Polym Sci,2006