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. 
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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. https://geodesic-test.mathdoc.fr/item/BASM_2019_2_a6/

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