Llibre, Jaume, and Claudia Valls. “Phase Portraits on the Unit Sphere of the Stretch-Twist-Fold Flow”. Nonlinear Analysis: Modelling and Control 28, no. 5 (August 28, 2023): 1020–1036. Accessed August 28, 2026. https://zurnalai.vu.lt/nonlinear-analysis/article/view/33088.