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@article{MZ_1959__72_183599, author = {Einar Hille}, title = {An {Application} of {Pr\"ufer's} {Method} to a {Singular} {Boundary} {Value} {Problem.}}, journal = {Mathematische Zeitschrift}, pages = {95--106}, publisher = {mathdoc}, volume = {72}, year = {1959}, zbl = {0085.30302}, url = {http://geodesic.mathdoc.fr/item/MZ_1959__72_183599/} }
Einar Hille. An Application of Prüfer's Method to a Singular Boundary Value Problem.. Mathematische Zeitschrift, Tome 72 (1959), pp. 95-106. http://geodesic.mathdoc.fr/item/MZ_1959__72_183599/