Markov, Konstantin, and Krassimir Zvyatkov. “On the Optimal Third-Order Bounds on the Effective Elastic Moduli of Random Dispersions of Spheres”. Ann. Sofia Univ. Fac. Math. and Inf. 83, no. 2 (December 12, 1992): 37–64. Accessed November 24, 2024. https://ftl5.uni-sofia.bg./index.php/fmi/article/view/514.