TÓTH, György. Free vibration analysis of a rotating shaft of variable cross section using the finite element method. Periodica Polytechnica Electrical Engineering, [S. l.], v. 24, n. 1-2, p. 67–75, 1980. Disponível em: https://pp.bme.hu/ee/article/view/4797. Acesso em: 19 may. 2024.