%0 Journal Article %A A. A. Zaitsev %A E. V. Zaitseva %T Integrable newtonian systems with nonpotential force fields %J Matematičeskoe modelirovanie %D 2006 %P 126-128 %V 18 %N 5 %U http://geodesic.mathdoc.fr/item/MM_2006_18_5_a10/ %G ru %F MM_2006_18_5_a10