Geodesic
Necessary and Sufficient Conditions for a System of Eigenfunctions and Associated Functions of a Sturm-liouville Operator with Discontinuous Coefficients to Possess the Basis Property
Publications de l'Institut Mathématique, _N_S_38 (1985) no. 52, p. 119 .

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

In this paper we establish necessary and sufficient conditions which an arbitrary minimal and complete system of eigenfunctions and associated functions of a Sturm--Liouville operator with discontinuous coefficients must satisfy in order to have the basis property in the sense of V.A.~Il'in [1].
Classification : 34B25 
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     author = {Neboj\v{s}a L. La\v{z}eti\'c},
     title = {Necessary and {Sufficient} {Conditions} for a {System} of {Eigenfunctions} and {Associated} {Functions} of a {Sturm-liouville} {Operator} with {Discontinuous} {Coefficients} to {Possess} the {Basis} {Property}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {119 },
     publisher = {mathdoc},
     volume = {_N_S_38},
     number = {52},
     year = {1985},
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Nebojša L. Lažetić. Necessary and Sufficient Conditions for a System of Eigenfunctions and Associated Functions of a Sturm-liouville Operator with Discontinuous Coefficients to Possess the Basis Property. Publications de l'Institut Mathématique, _N_S_38 (1985) no. 52, p. 119 . http://geodesic.mathdoc.fr/item/PIM_1985_N_S_38_52_a16/