1. L. Peters and H. J. Woods. “The Mechanical Properties of Textile Fibres”, ed. R. Meredith. 153—241, Amsterdam 1956.
2. B. Olofsson and Wm. D. Mohr. Unpublished.
3. R. Meredith. The Mechanical Properties of Textile Fibres, p.87–98, Amsterdam, 1956.