GANCZARSKI, A.; LENCZOWSKI, J. On the convexity of the Goldenblat-Kopnov yield condition. Archives of Mechanics, Warsaw, Poland, v. 49, n. 3, p. 461–475, 1997. Disponível em: https://am.ippt.pan.pl/index.php/am/article/view/v49p461. Acesso em: 19 nov. 2025.