Phillips, D. L. A Technique for the Numerical Solution of Certain Integral Equations of the First Kind. Journal of the ACM. 1962, 9: 84–97. S2CID 35368397. doi:10.1145/321105.321114.
Foster, M. An Application of the Wiener-Kolmogorov Smoothing Theory to Matrix Inversion. Journal of the Society for Industrial and Applied Mathematics. 1961, 9 (3): 387–392. doi:10.1137/0109031.
Phillips, D. L. A Technique for the Numerical Solution of Certain Integral Equations of the First Kind. Journal of the ACM. 1962, 9: 84–97. S2CID 35368397. doi:10.1145/321105.321114.