Yi Xu, Peeyush Bhargava, Alan Zehnder, 
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polyimide at high temperature, Mechanics of Materials, Volume 100, 
September 2016, Pages 86-95, http://dx.doi.org/10.1016/j.mechmat.2016.06.009

Free access until August 11, 2016:  http://authors.elsevier.com/a/1TFcBc7qwIfUD