Geodesic
The $GL(2,{\mathbb R})$-orbits of polynomial differential systems of degree four
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 3 (2006), pp. 65-72

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In this paper we characterize the $GL(2,{\mathbb R})-$orbits of the differential systems $\dot{x}_1=P(x_1,x_2)$, $\dot{x}_2=Q(x_1,x_2),$ where $P,Q$ are polynomials of degree four, with respects to their dimensions. 
@article{BASM_2006_3_a6,
     author = {Angela P\u{a}\c{s}canu},
     title = {The $GL(2,{\mathbb R})$-orbits of polynomial differential systems of degree four},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {65--72},
     publisher = {mathdoc},
     number = {3},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2006_3_a6/}
}
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Angela Păşcanu. The $GL(2,{\mathbb R})$-orbits of polynomial differential systems of degree four. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 3 (2006), pp. 65-72. http://geodesic.mathdoc.fr/item/BASM_2006_3_a6/