GRYSHCHUK, S. V. Effective Conductivity of 2D Ellipse – Elliptical Ring Composite Material. Збірник Праць Інституту математики НАН України, [S. l.], v. 12, n. 3, p. 121–132, 2015. Disponível em: https://trim.imath.kiev.ua/index.php/trim/article/view/172. Acesso em: 2 трав. 2024.