1. Bayer O, Verfahren zur Herstellung von Polyurethanen bzw. Polyharnstoffen, Patent DE728981, 1937.
2. Father of polyurethanes;Seymour,1989
3. Materials: introduction and applications;Brostow,2017
4. Flexibility of polymers defined and related to dynamic friction;Brostow;J Mater Sci Res,2019
5. Infrared studies of segmented polyurethan elastomers. I. Hydrogen bonding;Seymour;Macromolecules,1970