Valery P. Privalko, Vassily P. Azarenkov, Alexander V. Baibak, Andrey A. Usenko, Thermodynamic characterization of segmented polyurethanes,
Thermochimica Acta, Volume 285, Issue 1, Advances in International Thermal Sciences: Polymers, Inorganics, Biological Materials and Techniques, 10 August 1996, Pages 155-165,
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http://dx.doi.org/10.1016/0040-6031(96)02878-X