@article{10_4064_am_22_2_285_309,
     author = {Javier Chavarriga},
     title = {Integrable systems in the plane with center type linear part},
     journal = {Applicationes Mathematicae},
     pages = {285--309},
     publisher = {mathdoc},
     volume = {22},
     number = {2},
     year = {1993},
     doi = {10.4064/am-22-2-285-309},
     zbl = {0809.34002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am-22-2-285-309/}
}