Textile and Apparel, Technology and Management - 1973 Batra, S. (1973). The normal force between twisted filaments part I: The fiber-wound-on-a-cylinder model-analytical treatment. Journal of the Textile Institute, 64(4), 209–222. https://doi.org/10.1080/00405007308630431 Batra, S. K., Berg, C. A., & Tirosh, J. (1973). Wear and friction of two different types of graphite fiber reinforced composites materials. Fibre Science and Technology, 6(3), 159. https://doi.org/10.1016/0015-0568(73)90018-3 Batra, S. K., Tayebi, A., & Backer, S. (1973). The normal force between twisted filaments part II: Experimental verification. Journal of the Textile Institute, 64(4), 363–373. https://doi.org/10.1080/00405007308630258