KOZÁK, I.; SZEIDL, Gy. Complete Solution for Stresses in Terms of Stress Functions. Part II: Modification of Variational Principles. Technische Mechanik - European Journal of Engineering Mechanics, [S. l.], v. 16, n. 3, p. 197–208, 2019. Disponível em: https://journals.ub.ovgu.de/index.php/techmech/article/view/1239. Acesso em: 18 may. 2024.