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Bibliography

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Ph. Clément and J. A. Nohel, Abstract linear and nonlinear Volterra equations preserving positivity, SIAM J. Math. Anal. 12 (1979), 365-388. MR 523852 (80b:47095)

[2]

M. C. Delfour and J. Karrakchou, State space theory of linear time invariant systems with delays in state, control and observation variations, J. Math. Anal. Appl. 125 (1987), 361-450. MR 896174 (88m:93096)

[3]

G. Gripenberg, S. O. Londen, and O. J. Staffans, Volterra integral and functional equations, Cambridge Univ. Press, Cambridge, 1990. MR 1050319 (91c:45003)

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R. K. Miller, Linear Volterra integrodifferential equations as a semigroup, Funkcial. Ekvac. 17 (1974), 39-55. MR 0350511 (50:3003)

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J. Prüss, Linear hyperbolic Volterra equations of scalar type, semigroup theory and applications (Ph. Clément, S. Invernizzi, E. Mitidieri, and I. Vrabie, eds.), Dekker, New York, 1989, pp. 367-384. MR 1009408 (90i:45021)

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M. Renardy, W. J. Hrusa, and J. A. Nohel, Mathematical problems in viscoelasticity, Pitman Monographs Surveys Pure Appl. Math., vol. 34, Longman Sci. Tech., Harlow, Essex, 1988. MR 919738 (89b:35134)