Geodesic
On limit cycles of polynomial systems of the first-order ODE's
Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 2 (2019), pp. 113-126

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Examples of four-dimensional Riemann metrics related with the ODE's of second order are constructed. Their properties and applications to the polynomial systems of ODE's of first order are considered. 
@article{BASM_2019_2_a6,
     author = {Valery Dryuma},
     title = {On limit cycles of polynomial systems of the first-order {ODE's}},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {113--126},
     publisher = {mathdoc},
     number = {2},
     year = {2019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2019_2_a6/}
}
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Valery Dryuma. On limit cycles of polynomial systems of the first-order ODE's. Buletinul Academiei de Ştiinţe a Republicii Moldova. Matematica, no. 2 (2019), pp. 113-126. http://geodesic.mathdoc.fr/item/BASM_2019_2_a6/