T. Czaplinski, P. Drygaś, S. Gluzman, V. Mityushev, W. Nawalaniec, and G. Zietek, “Elastic properties of a unidirectional composite reinforced with hexagonal array of fibers”, Arch. Mech., vol. 70, no. 3, pp. 207–239, Jun. 2018, doi: 10.24423/aom.2765.