Kozák, I. and Szeidl, G. (2019) “Complete Solution for Stresses in Terms of Stress Functions. Part II: Modification of Variational Principles”, Technische Mechanik - European Journal of Engineering Mechanics, 16(3), pp. 197–208. Available at: https://journals.ub.ovgu.de/index.php/techmech/article/view/1239 (Accessed: 18 May 2024).