Geodesic
Picard's Demonstration of the General Theorem upon the Existence of Integrals of Ordinary Differential Equations.
Bulletin of the New York Mathematical Society, Tome 1 (1891), pp. 12-16 
Èmile Picard. Picard's Demonstration of the General Theorem upon the Existence of                Integrals of Ordinary Differential Equations.. Bulletin of the New York Mathematical Society, Tome 1 (1891), pp. 12-16. http://geodesic.mathdoc.fr/item/BNYMS_1891__1_186488/
@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},
     year = {1891},
     volume = {1},
     url = {http://geodesic.mathdoc.fr/item/BNYMS_1891__1_186488/}
}
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%D 1891
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