TY  - JOUR
AU  - Schulze-Halberg, Axel
TI  - A simple method for constructing non-liouvillian first integrals of autonomous planar systems
JO  - Czechoslovak Mathematical Journal
PY  - 2006
SP  - 987
EP  - 999
VL  - 56
IS  - 3
PB  - mathdoc
UR  - https://geodesic-test.mathdoc.fr/item/CMJ_2006__56_3_a17/
LA  - en
ID  - CMJ_2006__56_3_a17
ER  -