@article{BNYMS_1891__1_186488,
     author = {\`Emile Picard},
     title = {Picard's {Demonstration} of the {General} {Theorem} upon the {Existence} of                {Integrals} of {Ordinary} {Differential} {Equations.}},
     journal = {Bulletin of the New York Mathematical Society},
     pages = {12--16},
     publisher = {mathdoc},
     volume = {1},
     year = {1891},
     url = {http://geodesic.mathdoc.fr/item/BNYMS_1891__1_186488/}
}