Braynov, P. and Christov, O. (2009) “Non-integrability of a Hamiltonian system, based on a problem of nonlinear vibration of an elastic string”, Ann. Sofia Univ. Fac. Math. and Inf, 99, pp. 137–153. Available at: https://stipendii.uni-sofia.bg/index.php/fmi/article/view/118 (Accessed: 4 December 2024).