On attainability of Hashin-Shtrikman bounds by iterative hexagonal layering. Plane elasticity problems. Archives of Mechanics, [S. l.], v. 49, n. 3, p. 513–523, 1997. Disponível em: https://am.ippt.pan.pl/index.php/am/article/view/v49p513. Acesso em: 18 sep. 2025.