Titchmarsh, E. C. (1958). Eigenfunction expansions associated with second-order differential equations. Clarendon Press.
Citace podle Chicago (17th ed.)Titchmarsh, Edward Charles. Eigenfunction Expansions Associated with Second-order Differential Equations. Oxford: Clarendon Press, 1958.
Citace podle MLA (9th ed.)Titchmarsh, Edward Charles. Eigenfunction Expansions Associated with Second-order Differential Equations. Clarendon Press, 1958.
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