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Non-integrable systems with algebraic singularities in complex timeBountis, T; Drossos, L; Percival, I C · Journal of Physics A: Mathematical and General · 1991
On the non-integrability of a family of Duffing-van der Pol oscillatorsBountis, T C; Drossos, L B; Lakshmanan, M; Parthasarathy, S · Journal of Physics A: Mathematical and General · 1993