KIRILLOV, O. N. Singularities in Structural Optimization of the Ziegler Pendulum. Acta Polytechnica, [S. l.], v. 51, n. 4, 2011. DOI: 10.14311/1400. Disponível em: https://ojst.is.cvut.cz/ojs/index.php/ap/article/view/1400.. Acesso em: 27 jun. 2025.