@article{davis_singletary_srinivasarao_knoff_ramasubramanian_2000, title={Microstructure organization in para-aramid fibers}, volume={70}, ISSN={["0040-5175"]}, DOI={10.1177/004051750007001102}, abstractNote={ The existence of "lateral birefringence," i.e., the difference between the refractive index for light polarized parallel to the fiber radius and light polarized perpendicular to the radius in the cross-sectional plane, combined with the existence of electron diffraction contrast "bands" in longitudinal fiber sections has led to work appearing to indicate that para-aramid fibers, in particular poly(para-phenylene terephthalamide), have an almost crystallographically perfect orthotropic structure in which the hydrogen bonds are all parallel to fiber radii. Optical path difference profiles, calculated based on the proposed orthotropic structure, are in reasonable qualitative agreement with interference microscope data. Quantitatively, however, the orthotropic structure is only partially developed based on published values of the principle refractive indices. Furthermore, the degree to which this structure is developed varies with distance from the fiber axis in some fibers' types. }, number={11}, journal={TEXTILE RESEARCH JOURNAL}, author={Davis, H and Singletary, J and Srinivasarao, M and Knoff, W and Ramasubramanian, MK}, year={2000}, month={Nov}, pages={945–950} }
 @article{singletary_davis_ramasubramanian_knoff_toney_2000, title={The transverse compression of PPTA fibers - Part I - Single fiber transverse compression testing}, volume={35}, ISSN={["0022-2461"]}, DOI={10.1023/A:1004764024568}, number={3}, journal={JOURNAL OF MATERIALS SCIENCE}, author={Singletary, J and Davis, H and Ramasubramanian, MK and Knoff, W and Toney, M}, year={2000}, month={Feb}, pages={573–581} }
 @article{singletary_davis_song_ramasubramanian_knoff_2000, title={The transverse compression of PPTA fibers - Part II - Fiber transverse structure}, volume={35}, ISSN={["1573-4803"]}, DOI={10.1023/A:1004716108638}, number={3}, journal={JOURNAL OF MATERIALS SCIENCE}, author={Singletary, J and Davis, H and Song, Y and Ramasubramanian, MK and Knoff, W}, year={2000}, month={Feb}, pages={583–592} }