Gryshchuk, Serhii, and Sergei Rogosin. “Effective Conductivity of 2D Disk – Ring Composite Material”. Mathematical Modelling and Analysis 18, no. 3 (June 1, 2013): 386-394. Accessed December 2, 2024. https://mma.vgtu.lt/index.php/MMA/article/view/4121.