MARKOV, K.; ILIEVA, K. A note on the $C^{2}$-term of the effective conductivity for random dispersions. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 84, p. 123–138, 1993. Disponível em: https://admin.uni-sofia.bg/index.php/fmi/article/view/475. Acesso em: 16 jan. 2025.