%0 Journal Article %A Furta, Stanislav %A Zampieri, Gaetano %T Cruising in a central force field. %J Portugaliae mathematica %D 2004 %P 259-280 %V 61 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_2004__61_3_51278/ %G en %F PORMA_2004__61_3_51278