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L. de Branges, Local operators on Fourier transforms, Duke Math. J. 25 (1958), 143-154, MR 0091380 (19:958b)

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G. K. Kalisch, On similarity, reducing manifolds, and unitary equivalence of certain Volterra operators, Ann. of Math. 66 (1957), 481-494. MR 0091443 (19:970a)

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K. Kodaira, The eigenvalue problem for ordinary differential equations and Heisenberg's theory of S-matrices, Amer. J. Math. 71 (1949), 921-945. MR 0033421 (11:438c)

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