@article{BASM_2004_3_a7,
     author = {Yu. L. Bondar and A. P. Sadovskii},
     title = {Variety of the center and limit cycles of a~cubic system, which is reduced to lienard form},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {71--90},
     publisher = {mathdoc},
     number = {3},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2004_3_a7/}
}