@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/}
}