Leonov, G. A., Smirnova, V. B., & Sperling, L. (2019). A Frequency-Domain Criterion for Global Stability of Systems with Angular Coordinates. Technische Mechanik - European Journal of Engineering Mechanics, 17(3), 223–229. Retrieved from https://journals.ub.ovgu.de/index.php/techmech/article/view/1202