1. B.D. Bojanov, H.A. Hakopian, A.A. Sahakian, Spline functions and multivariate interpolation, Kluwer, Dordrecht, 1993.
2. C. de Boor, K. Höllig, Bivariate box-splines and smooth pp functions on a three direction mesh, J. Comput. Appl. Math. 9 (1983), 13–28.
3. C. de Boor, K. Höllig, S. Riemenschneider, Box-splines, Springer, New-York, 1993.
4. C. de Boor, Quasiinterpolants and approximation power of multivariate splines in Computation of curves and surfaces, W. Dahmen, M. Gasca, C.A. Micchelli (eds), Kluwer, Dordrecht (1990), 313–345.
5. P.L. Butzer, M. Schmidt, E.L. Stark, L. Voigt, Central factorial numbers; their main properties and some applications, Numer. Funct.Anal. and Optimiz. 10, 5 and 6 (1989), 419–488.