1. Approximation by integro cubic splines;Behforooz;Appl. Math. Comput.,2006
2. Integro cubic splines and their approximation properties;Zhanlav;Appl. Math. Series, Tver State University, Russia,2008
3. Yu.S. Zav’yalov, B.I. Kvasov, V.L. Miroschnichenko, Spline Function Methods M, 1980 (in Russian).
4. T. Zhanlav, B-representation of interpolatory cubic splines, Vychislitel’nye Systems, N87, Novisibirsk, 1981, pp. 3–10 (in Russian).