1. Painlevé analysis and integrability of the trapped ionic system
2. J. Morales-Ruiz, Differential Galois Theory and Non-integrability of Hamiltonian Systems (Birkhäuser., 1999).
3. O. Christov and G. Georgiev, “Non-integrability of some higher-order painleve equations in the sense of liouville,” SIGMA 11 045, 21 (2015).
4. A. Lyapunov, “On certain property of the differential equations of the problem of motion of a heavy rigid body having a fixed point,” Soobsch. Kharkov Math. Obscht. 2, 4, 1894, 123–140 (1954).
5. E. G. C. Poole, Introduction to the Theory of Linear Differential Equations (Oxford, At The Clarendon Press., 1936).