Iliev, H. (1996) “On the non-integrability of a Hamiltonian system resulting from a problem for elastic string”, Ann. Sofia Univ. Fac. Math. and Inf, 88, pp. 57–69. Available at: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/379 (Accessed: 21 November 2024).