1. J. H. Ahlberg, E. N. Nilson, and J. L. Walsh, The Theory of Splines and Their Applications (Academic, New York, 1967; Mir, Moscow, 1972).
2. Yu. S. Volkov, “Interpolation by splines of even degree according to Subbotin and Marsden,” Ukr. Math. J. 66 (7), 994–1012 (2014).
3. S. B. Stechkin and Yu. N. Subbotin, Splines in Numerical Mathematics (Nauka, Moscow, 1976) [in Russian].
4. Yu. S. Zav’yalov, B. I. Kvasov, and V. L. Miroshnichenko, Methods of Spline Functions (Nauka, Moscow, 1980) [in Russian].
5. Yu. S. Volkov, “Divergence of interpolating splines of odd degree,” in Computational Systems (IM SO AN SSSR, Novosibirsk, 1984), Issue 106, pp. 41–56 [in Russian].