Referencias:

• Beltrami, Wohlers, (1966) Distributions and the Boundary Values of Analytic Functions, , Academic Press
• Berberian, (1966) Notes in Spectral Theory, , Van Nostrand, New York/London
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• Capri, Representación exponencial de funciones operatoriales positivas reales de varias variables (1978) Trabajos Mat. I.A.M., 21
• Dolph, Positive real resolvents and linear passive systems (1963) Ann. Acad. Sci. Fennicae, 33 (9)
• Duren, (1970) Theory of Hp Spaces, , Academic Press, Princeton, NJ
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• Halmos, Lumer, Schäffer, Square roots of operators (1953) Proceedings of the American Mathematical Society, 4, pp. 142-149
• Hille, Phillips, Functional analysis and semigroups (1957) Amer. Math. Soc.
• Kato, (1966) Perturbation Theory for Linear Operators, , Springer-Verlag, New York/London
• Kato, Integration of the equation of evolution in a Banach space (1953) Journal of the Mathematical Society of Japan, 5, pp. 208-234
• Kato, On linear differential equations in Banach spaces (1956) Communications on Pure and Applied Mathematics, 9, pp. 479-486
• Zemanian, (1972) Realizability Theory for Continuous Linear Systems, , Academic Press, Berlin/New York
• Donghue, (1974) Monotone Matrix Functions and Analytic Continuation, , Springer-Verlag, New York
• Brune, Synthesis of a two-terminal network whose driving-point impedance is a prescribed function of frequency (1931) J. Math. Phys., 10, pp. 191-236

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