[1]
“On the non-integrability of a Hamiltonian system resulting from a problem for elastic string”, Ann. Sofia Univ. Fac. Math. and Inf., vol. 88, pp. 57–69, Dec. 1996, Accessed: Feb. 04, 2026. [Online]. Available: https://annual.uni-sofia.bg/index.php/fmi/article/view/379