%0 Journal Article %A Marino Zennaro %T Natural Runge-Kutta and Projection Methods. %J Numerische Mathematik %D 1988 %P 423-438 %V 53 %N 1-2 %I mathdoc %U http://geodesic.mathdoc.fr/item/NUMA_1988__53_1-2_133284/ %F NUMA_1988__53_1-2_133284