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C.S. Schollenberger, Polyurethan VC, a Virtually Crosslinked Elastomer, Rubber Chem. Technol., 35 (1962) 742.

Cooper, S. L.; Tobolsky, A. V., Properties of Linear Elastomeric Polyurethanes. J. Appl. Polym. Sci. 1966, 10, 1837-1844.
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Harrell, L. L., Segmented Polyurethanes . Properties as a Function of Segment Size and Distribution. Macromolecules 1969, 2 (6), 607-&.
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Yilgor, E.; Yurtsever, E.; Yilgor, I., Hydrogen bonding and polyurethane morphology. II. Spectroscopic, thermal and crystallization behavior of polyether blends with 1,3-dimethylurea and a model urethane compound. Polymer 2002, 43 (24), 6561-6568.
Lee, H. S.; Wang, Y. K.; Hsu, S. L., Spectroscopic Analysis of Phase-Separation Behavior of Model Polyurethanes. Macromolecules 1987, 20 (9), 2089-2095.

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