@article{10_4153_CJM_1967_119_0,
     author = {Ellis, Homer G.},
     title = {Solvability of {Ordinary} {Differential} {Equations} {Near} {Singular} {Points:} {An} {Analytic} {Case}},
     journal = {Canadian journal of mathematics},
     pages = {1303--1313},
     year = {1967},
     volume = {19},
     number = {1},
     doi = {10.4153/CJM-1967-119-0},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-119-0/}
}