@article{AIF_1983__33_1_131_0,
     author = {Ouchi, Sunao},
     title = {Characteristic {Cauchy} problems and solutions of formal power series},
     journal = {Annales de l'Institut Fourier},
     pages = {131--176},
     publisher = {Institut Fourier},
     address = {Grenoble},
     volume = {33},
     number = {1},
     year = {1983},
     doi = {10.5802/aif.907},
     mrnumber = {85g:35014},
     zbl = {0494.35017},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.907/}
}