VARIATIONAL METOD APPLIED IN CALCULATION OF KEY JOINT’S STRENGTH IN THE CURRENT CONSTRUCTION SYSTEMS. Academic journal Industrial Machine Building Civil Engineering, [S. l.], v. 2, n. 47, p. 133–139, 2017. Disponível em: https://ojs35.nupp.edu.ua/znp/article/view/77. Acesso em: 23 dec. 2025.