References

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MW Hirsch and S Smale, Differential equations, dynamical systems, and linear algebra, Academic Press, ISBN 0-12-349550-4 (1974)

2

C Hsu, Cell-to-cell mapping, Springer-Verlag, ISBN 0-387-96520-3 (1987)

3

TM MacRobert, Functions of a complex variable, Macmillan and co., London (1938)

4

K Konno and H Tateno, Duffing's equation in complex time and chaos, Progress in Theoretical Physics Letters, vol. 72 no. 5, pp 1047-1049 (1984)

5

YF Chang and G Corliss, Ratio-like and recurrence relation test for convergence of series, Journal of the Institute of Mathematics and its Applications, vol. 25, pp 349-359 (1980)