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2. The critical case of fourth-order resonance in a Hamiltonian system with one degree of freedom;Markeyev;Prikl. Mat. Mekh.,1997
3. Tables of Integrals, Sums, Series and Products;Gradshtein,1962
4. Atomic Physics;Born,1935
5. Some Problems in the Theory of Non-linear Oscillations;Malkin,1956