1. Fundamental properties of generalized splines;Ahlberg,1964
2. A general method for the construction of interpolating or smoothing spline-functions;Anselone;Numer. Math.,1968
3. Étude de Certains Noyaux et Théorie des Fonctions “Spline” en Analyse Numérique;Atteia,1966
4. On splines and their minimum properties;deBoor;J. Math. Mech.,1966
5. Splines, n-widths and optimal approximations;Golomb;MRC Technical Summary Report No. 784,1967