@article{BASM_2008_1_a2,
     author = {J. Llibre},
     title = {Open problems on the algebraic limit cycles of planar polynomial vector fields},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {19--26},
     publisher = {mathdoc},
     number = {1},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2008_1_a2/}
}