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2. E. C. Titchmarsh, Introduction to the theory of Fourier integrals, Oxford, Clarendon Press, 1937.
3. On the extreme eigenvalues of truncated Toeplitz matrices;Parter, Seymour V.;Bull. Amer. Math. Soc.,1961
4. On the eigenvalues of certain Hermitian operators;Widom, Harold;Trans. Amer. Math. Soc.,1958
5. Stable processes and integral equations;Widom, Harold;Trans. Amer. Math. Soc.,1961