@article{BASM_2003_1_a10,
     author = {Mircea Lupan and Nicolae Vulpe},
     title = {Classification of quadratic systems with a~symmetry center and simple infinite singular points},
     journal = {Buletinul Academiei de \c{S}tiin\c{t}e a Republicii Moldova. Matematica},
     pages = {102--119},
     publisher = {mathdoc},
     number = {1},
     year = {2003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BASM_2003_1_a10/}
}