1. The numerical solution of Fredholm integral equations of the second kind;Atkinson, Kendall E.;SIAM J. Numer. Anal.,1967
2. C. R. deBoor, The Method of Projections as Applied to the Numerical Solution of Two Point Boundary Value Problems Using Cubic Splines, Doctoral Thesis, University of Michigan, Ann Arbor, Mich., 1966.
3. On uniform approximation by splines;de Boor, Carl;J. Approximation Theory,1968