Zgorzelska, Anita, and Hanna Guze. “A Note on Bifurcation of Equilibrium Forms of a Gas Baloon Parachute”. Annales Mathematicae Silesianae 39, no. 2 (May 20, 2025): 368–380. Accessed December 5, 2025. https://journals.us.edu.pl/index.php/AMSIL/article/view/19073.