Leonov GA, Smirnova VB, Sperling L. A Frequency-Domain Criterion for Global Stability of Systems with Angular Coordinates. TechMech [Internet]. 2019 Oct. 13 [cited 2024 Apr. 27];17(3):223-9. Available from: https://journals.ub.ovgu.de/index.php/techmech/article/view/1202