%0 Journal Article %A Eric Busvelle %A Rachid Kharab %A A. Maciejewski %A Jean-Marie Strelcyn %T Numerical integration of differential equations in the presence of first integrals: observer method %J Applicationes Mathematicae %D 1993 %P 373-418 %V 22 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/am-22-3-373-418/ %R 10.4064/am-22-3-373-418 %G en %F 10_4064_am_22_3_373_418