@article{10_1017_S0017089500008405,
     author = {Ricceri, Biagio},
     title = {On the {Cauchy} problem for the differential equation f(t, x, x', ..., x(k)) = 0},
     journal = {Glasgow mathematical journal},
     pages = {343--348},
     year = {1991},
     volume = {33},
     number = {3},
     doi = {10.1017/S0017089500008405},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500008405/}
}