Markov, Konstantin, and Krassimir Zvyatkov. “ON THE EFFECTIVE BEHAVIOUR OF A NONLINEAR DISPERION OF SPHERES”. Ann. Sofia Univ. Fac. Math. and Inf. 82, no. 2 (December 12, 1991): 179–192. Accessed December 5, 2024. https://ftl5.uni-sofia.bg/index.php/fmi/article/view/543.