Zhao, C. et al. 2013. Effect of Naphthyridine-Like Structure in Polyacrylonitrile Stabilized Fibers on the Modulus of Carbon Fibers. Asian Journal of Chemistry. 25, 9 (Apr. 2013), 4878–4880. DOI:https://doi.org/10.14233/ajchem.2013.14132.