Cull, S. J., R. W. Tucker, R. S. Tung, and D. H. Hartley. 2019. “On Parametrically Excited Flexural Motion of an Extensible and Shearable Rod With a Heavy Attachment”. Technische Mechanik - European Journal of Engineering Mechanics 20 (2):147-57. https://journals.ub.ovgu.de/index.php/techmech/article/view/1077.