A simple method for constructing non-liouvillian first integrals of autonomous planar systems
Czechoslovak Mathematical Journal, Tome 56 (2006) no. 3, pp. 987-999.

Voir la notice de l'article dans Czech Digital Mathematics Library

We show that a transformation method relating planar first-order differential systems to second order equations is an effective tool for finding non-liouvillian first integrals. We obtain explicit first integrals for a subclass of Kukles systems, including fourth and fifth order systems, and for generalized Liénard-type systems.
Classification : 33C99, 34A25, 34C07, 34C14, 81U15
Mots-clés : planar polynomial systems; Kukles systems; generalized Liénard systems; non-liouvillian first integrals 
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     title = {A simple method for constructing non-liouvillian first integrals of autonomous planar systems},
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Schulze-Halberg, Axel. A simple method for constructing non-liouvillian first integrals of autonomous planar systems. Czechoslovak Mathematical Journal, Tome 56 (2006) no. 3, pp. 987-999. https://geodesic-test.mathdoc.fr/item/CMJ_2006__56_3_a17/