English
Matemàtica
World Cientific Publishing
http://www.worldscientific.com/doi/abs/10.1142/S0218127407019056?journalCode=ijbc
Electronic version of an article published in International Journal of Bifurcation and Chaos, 2007, vol. 17, núm. 9, pàg. 3295-3302. http://dx.doi.org/10.1142/S0218127407019056 © World Scientific Publishing Company. http://www.worldscientific.com/doi/abs/10.1142/S0218127407019056?journalCode=ijbc
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