1. Baszenski, G., Delvos, F.J., Posdorf, H., “Representation formulas for conforming bivari ate interpolation”. In: Approximation theory III. Ed. E. W. Cheney, Academic Press (1980), 193 – 198.
2. Delvos, F.J., Posdorf, H., “A representation formula for reduced Hermite interpolation”. In: Numeri sche Methoden der Approximationstheorie, Bd. 4. Eds.: L. Collatz, G. Meinardus, H. Werner. ISLAM 42 (1978), 124–137.
3. Gordon, W. J., “Distributive lattices and approximation of multivariate functions” Proc. Symp. Madison (Wi sc.) (1969), 223 – 277
4. Melkes, F., “Reduced piecewise bivariate Hermite interpolation”. Num. Math. 19 (1972), 326 – 340.
5. Phillips, G.M., “Explicit Forms for certain Hermite approximations” BIT 13 (1973), 177 – 180