http://onlinelibrary.wiley.com/doi/10.1002/pol.1968.150060701/abstract
Thermally stable polymers from 1,4,5,8-naphthalenetetracarboxylic acid and
aromatic tetraamines
R. L. Van Deusen, O. K. Goins, A. J. Sicree
Journal of Polymer Science Part A-1: Polymer Chemistry
Volume 6, Issue 7, pages 1777–1793, July 1968
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