“Approximate analytical investigation of the elastic-plastic behaviour of fibrous composites. Part II. External loading”, Ann. Sofia Univ. Fac. Math. and Inf., vol. 83, no. 2, pp. 21–35, Dec. 1992, Accessed: Feb. 04, 2026. [Online]. Available: https://annual.uni-sofia.bg/index.php/fmi/article/view/513