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@article{MAN_1964__156_161202, author = {W.N. EVERITT}, title = {Singular {Differential} {Equations} {I:} {The} {Even} {Order} {Case.}}, journal = {Mathematische Annalen}, pages = {9--24}, publisher = {mathdoc}, volume = {156}, year = {1964}, zbl = {0145.10902}, url = {http://geodesic.mathdoc.fr/item/MAN_1964__156_161202/} }
W.N. EVERITT. Singular Differential Equations I: The Even Order Case.. Mathematische Annalen, Tome 156 (1964), pp. 9-24. http://geodesic.mathdoc.fr/item/MAN_1964__156_161202/