Kolev, Marin, and Konstantin Markov. “A Note on the Bulk Modulus of a Binary Elastic Mixture”. Ann. Sofia Univ. Fac. Math. and Inf. 92 (December 12, 2000): 145–150. Accessed April 26, 2025. https://ftl5.uni-sofia.bg./index.php/fmi/article/view/261.