no. 2
On the chaotic behavior and the non-integrability of the four vortices problem
Annales de l'I.H.P. Physique théorique, Tome 55 (1991) no. 2, pp. 707-718. 
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Oliva, W. M. On the chaotic behavior and the non-integrability of the four vortices problem. Annales de l'I.H.P. Physique théorique, Tome 55 (1991) no. 2, pp. 707-718. http://www.numdam.org/item/AIHPA_1991__55_2_707_0/

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