@article{CMH_1972__47_139509,
     author = {Wilfried Kaplan},
     title = {Analytic {First} {Integrals} of {Ordinary} {Differential} {Equations}},
     journal = {Commentarii mathematici Helvetici},
     pages = {205--212},
     publisher = {mathdoc},
     volume = {47},
     year = {1972},
     zbl = {0247.34008},
     url = {http://geodesic.mathdoc.fr/item/CMH_1972__47_139509/}
}