Levin, V.N., and V.N. Nikolaievski. “On a General Theory of Composite Materials and Micro-Inhomogeneous Elastic Media”. Engineering Transactions 26, no. 1 (March 30, 1978): 115–130. Accessed July 16, 2025. https://et.ippt.pan.pl/index.php/et/article/view/2115.