CHALECKI, M.; JAWORSKI, J.; SZLACHETKA, O. First natural frequency of multi-segment floor joists with variable cross section. Scientific Review Engineering and Environmental Sciences (SREES), [S. l.], v. 28, n. 4, p. 526–538, 2019. DOI: 10.22630/PNIKS.2019.28.4.48. Disponível em: https://srees.sggw.edu.pl/article/view/106. Acesso em: 5 may. 2024.