1. Anselone, P. M.: Convergence and error bounds for approximate solutions of integral and operator equations. In: Error in digital computation, vol. II, ed. by L. B. Rall, 231?252. New York: John Wiley and Sons 1965.
2. Anselone, P. M.: Collectively compact operator approximation theory. Prentice-Hall, 1971.
3. Math. Research Center Technical Rep.;K. Atkinson,1966
4. Atkinson, K.: The numerical solution of Fredholm integral equations of the second kind. SIAM Num. Anal. Jour.4, 337?348 (1967).
5. Brakhage, H.: Über die numerische Behandlung von Integralgleichungen nach der Quadraturformelmethode. Numerische Math.2, 183?196 (1960).