%0 Journal Article %A Rack, Heinz-Joachim %A Vajda, Robert %T On Optimal Quadratic Lagrange Interpolation: Extremal Node Systems with Minimal Lebesgue Constant via Symbolic Computation %J Serdica Journal of Computing %D 2014 %P 71-96 %V 8 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SJC_2014_8_1_a4/ %G en %F SJC_2014_8_1_a4