@article{EJDE_2003__2003__a13,
     author = {Volokitin,  Evgenii P.},
     title = {Centering conditions for planar septic systems},
     journal = {Electronic journal of differential equations},
     year = {2003},
     volume = {2003},
     zbl = {1028.34033},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2003__2003__a13/}
}