1. Composition Materials [in Russian], Vol. 6, Moscow (1978).
2. Thermally Stable, Heat-Resistant, and Incombustible Fibers [in Russian], Moscow (1978).
3. S. C. Bennet and D. J. Johnson, ?Electron-microscope studies of structural heterogeneity in PAN-based carbon fibers,? Carbon,17, 25?39 (1979).
4. R. J. Diefendorf and E. Tokarsky, ?High-performance carbon fibers,? Polym. Eng. Sci.,15, No. 3, 150?159 (1975).
5. L. I. Bezruk, V. I. Graboshnikova, and V. D. Grinyuk, ?Morphology of polymeric materials as revealed by methods of diffraction and transmission electron microscopy,? in: Proc. 15th Czechoslovak Conf. on Electron Microscopy, Prague (1977), Vol. B, pp. 442?443.