CHEHIL, D.S.; DHALIWAL, R.S. On the longitudinal Vibrations of Tapered Bars. Engineering Transactions, [S. l.], v. 29, n. 3, p. 427–437, 1981. Disponível em: http://et.ippt.gov.pl/index.php/et/article/view/2067. Acesso em: 17 jan. 2026.