Geodesic
Center problem for cubic systems with a~bundle of two invariant straight lines and one invariant conic
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2012), pp. 32-49

Voir la notice de l'article provenant de la source Math-Net.Ru

For cubic differential systems with a bundle of two invariant straight lines and one invariant conic it is proved that a weak focus is a center if and only if the first four Liapunov quantities $L_j$, $j=\overline{1,4}$, vanish. 
@article{BASM_2012_1_a3,
     author = {Dumitru Cozma},
     title = {Center problem for cubic systems with a~bundle of two invariant straight lines and one invariant conic},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {32--49},
     publisher = {mathdoc},
     number = {1},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2012_1_a3/}
}
TY  - JOUR
AU  - Dumitru Cozma
TI  - Center problem for cubic systems with a~bundle of two invariant straight lines and one invariant conic
JO  - Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica
PY  - 2012
SP  - 32
EP  - 49
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/BASM_2012_1_a3/
LA  - en
ID  - BASM_2012_1_a3
ER  - 
%0 Journal Article
%A Dumitru Cozma
%T Center problem for cubic systems with a~bundle of two invariant straight lines and one invariant conic
%J Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica
%D 2012
%P 32-49
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/BASM_2012_1_a3/
%G en
%F BASM_2012_1_a3
Dumitru Cozma. Center problem for cubic systems with a~bundle of two invariant straight lines and one invariant conic. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 1 (2012), pp. 32-49. http://geodesic.mathdoc.fr/item/BASM_2012_1_a3/