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@article{MS2_1956__4_165604, author = {EARL A. CODDINGTON}, title = {On self-adjoint ordinary differential operators.}, journal = {Mathematica Scandinavica}, pages = {9--21}, publisher = {mathdoc}, volume = {4}, year = {1956}, zbl = {0074.06701}, url = {http://geodesic.mathdoc.fr/item/MS2_1956__4_165604/} }
EARL A. CODDINGTON. On self-adjoint ordinary differential operators.. Mathematica Scandinavica, Tome 4 (1956), pp. 9-21. http://geodesic.mathdoc.fr/item/MS2_1956__4_165604/