Tatiana V. Voitovich, Stefan Vandewalle, Barycentric Interpolation and Exact Integration Formulas for the Finite Volume Element Method i "Numerical analysis and applied mathematcs, AIP Conference Proceedings, 1048", (Simos, T., Psihoyios, G., Tsitouras, C. (Eds.)). International Conference on Numerical Analysis and Applied Mathematics. Kos, Grekland, 16 - 20 september 2008", sid. 575-579.