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3. Atkinson, K. E., A Survey of Numerical Methods for the Solution of Fredholm Integral Equations of the Second Kind, Society for Industrial and Applied Mathematics, Philadelphia, Pennsylvania, 1976.
4. Baker, C. T. H., The Numerical Treatment of Integral Equations, Cambridge University Press, Oxford, England, 1977.
5. Ivanov, V. V., The Theory of Approximate Methods and Their Application to the Numerical Solution of Singular Integral Equations, Translated by A. Ideh, edited by R. S. Anderssen and D. Elliott, Noordhoff International Publishing Company, Leyden, Holland, 1976 (Russian edition published in 1968 ).